<?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>0001489785</rptOwnerCik>
            <rptOwnerName>TONG JAMES JIAYUAN</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>false</isOfficer>
            <isTenPercentOwner>false</isTenPercentOwner>
            <isOther>false</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Ordinary Share</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>20000</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">On August 2, 2024, Horizon Space Acquisition II Sponsor Corp. (the &quot;Sponsor&quot;) transferred 20,000 ordinary shares of Horizon Space Acquisition II Corp (the &quot;Issuer&quot;) to Mr. James Jiayuan Tong. As a result, Mr. James Jiayuan Tong directly owns 20,000 ordinary shares of the Issuer.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ James Jiayuan Tong</signatureName>
        <signatureDate>2024-11-12-05:00</signatureDate>
    </ownerSignature>
</ownershipDocument>
