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

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2006-02-02</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000021759</issuerCik>
        <issuerName>COLLINS INDUSTRIES INC</issuerName>
        <issuerTradingSymbol>COLL</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001297972</rptOwnerCik>
            <rptOwnerName>Boston Avenue Capital</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>415 S. BOSTON AVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>TULSA</rptOwnerCity>
            <rptOwnerState>OK</rptOwnerState>
            <rptOwnerZipCode>74103</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2006-02-03</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1600</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>6.41</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>634305</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F2"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Acquired directly by Boston Avenue Capital</footnote>
        <footnote id="F2">Held directly by Boston Avenue Capital.</footnote>
    </footnotes>

    <remarks>This is a joint filing with Boston Avenue Capital, LLC as the designated filer.  Additional filers include Yorktown Avenue Capital, LLC, Value Fund Advisors and Charles Gillman.  Value Fund Advisors, LLC is the investement manager for both Boston Avenue and Yorktown Avenue.  Charles Gillman is the manager and a member of Value Fund Advisors.  All filers are located at the same address as Boston Avenue.

In addition to the shares held by Boston Avenue as designated above, the following entities own the following number if shares:

Yorktown Avenue Capital, LLC - 103,738
Value Fund Advisors, LLC - 738,043-  VFA disclaims beneficial ownership of these shares.
Charles Gillman - 738, 043 - Mr. Gillman disclaims beneficial ownership of these shares.</remarks>

    <ownerSignature>
        <signatureName>Frederic Dorwart</signatureName>
        <signatureDate>2006-02-07</signatureDate>
    </ownerSignature>
</ownershipDocument>
