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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2015-03-24</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001286131</issuerCik>
        <issuerName>STONEMOR PARTNERS LP</issuerName>
        <issuerTradingSymbol>STON</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001253805</rptOwnerCik>
            <rptOwnerName>FREEDMAN ALLEN</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O STONEMOR PARTNERS L.P.</rptOwnerStreet1>
            <rptOwnerStreet2>311 VETERANS HIGHWAY, SUITE B</rptOwnerStreet2>
            <rptOwnerCity>LEVITTOWN</rptOwnerCity>
            <rptOwnerState>PA</rptOwnerState>
            <rptOwnerZipCode>19056</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <derivativeTransaction>
            <securityTitle>
                <value>Restricted Phantom Units</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F1"/>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2015-03-24</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>696.6214</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>28.71</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <exerciseDate>
                <footnoteId id="F2"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F2"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>common units</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>696.6214</value>
                    <footnoteId id="F3"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>22662.3166</value>
                    <footnoteId id="F4"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Each restricted phantom unit representing limited partner interests is the economic equivalent of one common unit representing limited partner interests. Restricted phantom units become payable, in cash or common units, at the election of the issuer, upon the separation of the reporting person from service as a director or upon the occurrence of certain other events specified in Section 409A of the Internal Revenue Code of 1986, as amended.</footnote>
        <footnote id="F2">See Footnote 1.</footnote>
        <footnote id="F3">The reporting person received these restricted phantom units pursuant to the StoneMor Partners L.P. 2014 Long-Term Incentive Plan in lieu of payment to the reporting person of $20,000 which represents a portion of his annual director's retainer fee.</footnote>
        <footnote id="F4">Represents restricted phantom units allocated to the reporting person's deferred compensation account, including distribution equivalent rights that accrued under StoneMor Partners L.P. 2014 Long-Term Incentive Plan and under StoneMor Partners L.P. Long-Term Incentive Plan, as amended, credited to such person's deferred compensation account in the form of phantom units and accrued on all phantom units allocated or credited to such account.</footnote>
    </footnotes>

    <remarks>The filing of this statement shall not be construed as an admission (a) that the person filing this statement is, for the purposes of Section 16 of the Securities Exchange Act of 1934, as amended, the beneficial owner of any equity securities covered by this statement, or (b) that this statement is legally required to be filed by such person.</remarks>

    <ownerSignature>
        <signatureName>/s/ Shirley Herman, Attorney-in-Fact</signatureName>
        <signatureDate>2015-03-25</signatureDate>
    </ownerSignature>
</ownershipDocument>
