<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2021-07-30</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001863294</issuerCik>
        <issuerName>DA32 Life Science Tech Acquisition Corp.</issuerName>
        <issuerTradingSymbol>DALS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001219039</rptOwnerCik>
            <rptOwnerName>CRANDELL KEITH</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>DA32 LIFE SCIENCE TECH ACQUISITION CORP</rptOwnerStreet1>
            <rptOwnerStreet2>345 PARK AVENUE SOUTH, 12TH FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>100100</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2021-07-30</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1600000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>10.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1600000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Through ARCH Venture Fund XI, L.P.</value>
                    <footnoteId id="F4"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2021-07-30</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F2"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>650000</value>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>10.00</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2250000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Through DA32 Sponsor LLC</value>
                    <footnoteId id="F5"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">ARCH Venture Fund XI, L.P. (&quot;AVF&quot;) purchased 1,600,000 shares of the Issuer's Class A common stock for $10.00 per share in the Issuer's initial public offering.</footnote>
        <footnote id="F2">DA32 Sponsor LLC (&quot;Sponsor&quot;) purchased 650,000 shares of Class A common stock directly from the Issuer in a private placement for $10.00 per share, concurrently with the Issuer's initial public offering. This
purchase was exempted pursuant to Rule 16b-3(d) under the Securities Exchange Act of 1934, as amended.</footnote>
        <footnote id="F4">As the sole general partner of AVF, ARCH Venture Partners XI, L.P. (&quot;AVP LP&quot;) may be deemed to beneficially own the securities owned directly by AVF. As the sole general partner of AVP LP, ARCH Venture Partners XI, LLC (&quot;AVP LLC&quot;) may be deemed to beneficially own securities owned directly by AVF. As a member of the investment committee of AVP LLC, Keith Crandell may be deemed to beneficially own securities owned directly by AVF. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of such Reporting Person's pecuniary interest therein.</footnote>
        <footnote id="F5">As a managing member of Sponsor, AVF may be deemed to beneficially own the securities owned directly by Sponsor. As the sole general partner of AVF, AVP LP may be deemed to beneficially own the securities owned directly by Sponsor. As the sole general partner of AVP LP, AVP LLC may be deemed to beneficially own securities owned directly by Sponsor. As the members of the investment committee of AVP LLC, each of Kristina Burow, Robert Nelsen, Keith Crandell and Steven Gillis may be deemed to beneficially own securities owned directly by Sponsor. Each of the foregoing entities and individuals is a member of a Section 13(d) group. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of such Reporting Person's pecuniary interest therein.</footnote>
    </footnotes>

    <remarks>Henrikki Harsu, Attorney-in-Fact: Power of Attorney, which is hereby incorporated by reference to Exhibit 24 to a Form 3 with regard to DA32 Life Science Tech Acquisition Corp. filed with the Securities and Exchange Commission on July 27, 2021 by Keith Crandell.</remarks>

    <ownerSignature>
        <signatureName>/s/ Henrikki Harsu, Attorney-in-Fact</signatureName>
        <signatureDate>2021-08-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
