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

    <schemaVersion>X0303</schemaVersion>

    <documentType>5</documentType>

    <periodOfReport>2008-12-31</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <form3HoldingsReported>0</form3HoldingsReported>

    <form4TransactionsReported>1</form4TransactionsReported>

    <issuer>
        <issuerCik>0000926865</issuerCik>
        <issuerName>CECIL BANCORP INC</issuerName>
        <issuerTradingSymbol>CECB</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001368746</rptOwnerCik>
            <rptOwnerName>McFadden Leslie</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>2110 CHAPEL ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>HAVRE DE GRACE</rptOwnerCity>
            <rptOwnerState>MD</rptOwnerState>
            <rptOwnerZipCode>21078</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2006-07-26</value>
            </transactionDate>
            <transactionCoding>
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                <footnoteId id="F2"/>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
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                </transactionShares>
                <transactionPricePerShare>
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                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>8467.7188</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
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                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2006-07-26</value>
            </transactionDate>
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            <transactionTimeliness>
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                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
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            </transactionDate>
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                </transactionShares>
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            <transactionTimeliness>
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                <transactionPricePerShare>
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            </transactionAmounts>
            <postTransactionAmounts>
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        <nonDerivativeTransaction>
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            </securityTitle>
            <transactionDate>
                <value>2006-10-30</value>
            </transactionDate>
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                </transactionShares>
                <transactionPricePerShare>
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                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
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            </transactionAmounts>
            <postTransactionAmounts>
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        <nonDerivativeTransaction>
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            </transactionDate>
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    <footnotes>
        <footnote id="F1">Pursuant to participation in dividend reinvestment program</footnote>
        <footnote id="F2">1% Stock Dividend</footnote>
        <footnote id="F3">100% Stock Split</footnote>
        <footnote id="F4">Certificate issued</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Les McFadden</signatureName>
        <signatureDate>2009-02-13</signatureDate>
    </ownerSignature>
</ownershipDocument>
