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

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2024-11-12-05:00</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0002032950</issuerCik>
        <issuerName>Horizon Space Acquisition II Corp.</issuerName>
        <issuerTradingSymbol>HSPT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001914823</rptOwnerCik>
            <rptOwnerName>Li Mingyu</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O HORIZON SPACE ACQUISITION II CORP.</rptOwnerStreet1>
            <rptOwnerStreet2>1412 BROADWAY, 21ST FLOOR, SUITE 21V</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10018</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>true</isDirector>
            <isOfficer>true</isOfficer>
            <isTenPercentOwner>true</isTenPercentOwner>
            <isOther>false</isOther>
            <officerTitle>Chief Executive Officer</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Ordinary Share</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1868500</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Private Rights</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>0</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F4"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F4"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Ordinary Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>21350</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Assuming the over-allotment option is exercised by the underwriters of the IPO of Horizon Space Acquisition II Corp. (the &quot;Issuer&quot;) in full within 45 days of the offering, Mr. Mingyu Li may be deemed to beneficially own 1,655,000 ordinary shares of the Issuer held by Horizon Space Acquisition II Sponsor Corp. (the &quot;Sponsor&quot;).</footnote>
        <footnote id="F2">The Sponsor is the record holder of the shares reported herein. Mr. Mingyu (Michael) Li beneficially owns 50% issued and outstanding shares of the Sponsor. In accordance with the governing documents of the Sponsor, Mr. Mingyu (Michael) Li is the sole director of the sponsor and deemed to have the voting and dispositive rights over the securities of us held by the sponsor.</footnote>
        <footnote id="F3">Including (i) 1,655,000 ordinary shares of the Issuer acquired by the Sponsor prior to the IPO including up to 225,000 ordinary shares subject to forfeiture to the extent that the over-allotment option by the underwriters is not exercised in full or in part; and (ii) up to 213,500 ordinary shares of the Issuer underlying the private units (&quot;Private Units&quot;) to be acquired by the Sponsor in a private placement simultaneously with the consummation of the IPO. Each Private Unit consists of one ordinary share and one right.</footnote>
        <footnote id="F4">As described in the Rights Agreement dated November 14, 2024, between the Issuer and VStock Transfer, LLC, and filed as Exhibit 4.4 to the Registration Statement, the private rights will automatically convert into one-tenth (1/10) of one ordinary share upon the completion of the business combination.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Mingyu Li</signatureName>
        <signatureDate>2024-11-12-05:00</signatureDate>
    </ownerSignature>
</ownershipDocument>
