<?xml version="1.0"?>
<ownershipDocument>
    <schemaVersion>X0101</schemaVersion>

    <documentType>4</documentType><periodOfReport>2003-07-22</periodOfReport>
    <issuer>
        <issuerCik>0000931707</issuerCik>
        <issuerName>MAXCOR FINANCIAL GROUP INC</issuerName>
        <issuerTradingSymbol>MAXF</issuerTradingSymbol></issuer><reportingOwner><reportingOwnerId>
            <rptOwnerCik>0001021539</rptOwnerCik>
            <rptOwnerName>REIHL KEITH E</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>  </rptOwnerStreet1>
            <rptOwnerStreet2>  </rptOwnerStreet2>
            <rptOwnerCity>  </rptOwnerCity>
            <rptOwnerState>  </rptOwnerState>
            <rptOwnerZipCode>  </rptOwnerZipCode>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>1</isDirector><isOfficer>1</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther><officerTitle>Chief Operating Officer</officerTitle></reportingOwnerRelationship></reportingOwner><derivativeSecurity><securityTitle><value>Option -- Right to Buy</value></securityTitle><conversionOrExercisePrice><value>10.70</value></conversionOrExercisePrice><transactionDate><value>2003-07-22</value></transactionDate><deemedExecutionDate><value>1988-08-08</value></deemedExecutionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>A</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionAmounts><transactionShares><value>25000</value></transactionShares><transactionValue><value>0</value></transactionValue><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></transactionAmounts><exerciseDate><value>2004-07-22</value><footnoteId id="F1"/></exerciseDate><expirationDate><value>2013-07-21</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Common Stock</value></underlyingSecurityTitle><underlyingSecurityShares><value>25000</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>25000</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeSecurity><footnotes><footnote id="F1">The reported transaction involved the grant on July 22, 2003 of a non-qualified stock option under the Company's 2002 Stock Option Plan.  The grant provides for vesting of the option in equal 25% increments on each of the 1st, 2nd, 3rd and 4th anniversaries of the date of grant.</footnote></footnotes><ownerSignature><signatureName>KEITH E. REIHL</signatureName><signatureDate>2003-07-22</signatureDate></ownerSignature></ownershipDocument>

