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

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2004-12-03</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001075247</issuerCik>
        <issuerName>BIG SKY ENERGY CORP</issuerName>
        <issuerTradingSymbol>BSKO</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001319843</rptOwnerCik>
            <rptOwnerName>SWERSKY BARRY RAYMOND</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>P.O. BOX 110, 47100</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>RAMAT HASHARON</rptOwnerCity>
            <rptOwnerState>L3</rptOwnerState>
            <rptOwnerZipCode>00000</rptOwnerZipCode>
            <rptOwnerStateDescription>ISRAEL</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <remarks>Mr. Swersky was elected to the board of directors of Big Sky Energy Corporation on December 3, 2004.</remarks>

    <ownerSignature>
        <signatureName>/s/ Barry Swersky</signatureName>
        <signatureDate>2005-03-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
