<SEC-DOCUMENT>0001209191-11-063244.txt : 20111228
<SEC-HEADER>0001209191-11-063244.hdr.sgml : 20111228
<ACCEPTANCE-DATETIME>20111228163214
ACCESSION NUMBER:		0001209191-11-063244
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20111216
FILED AS OF DATE:		20111228
DATE AS OF CHANGE:		20111228

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BLACKROCK MUNIVEST FUND II INC
		CENTRAL INDEX KEY:			0000897269
		STANDARD INDUSTRIAL CLASSIFICATION:	UNKNOWN SIC - 0000 [0000]
		IRS NUMBER:				223220659
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1031

	BUSINESS ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809
		BUSINESS PHONE:		8004417762

	MAIL ADDRESS:	
		STREET 1:		100 BELLEVUE PARKWAY
		CITY:			WILMINGTON
		STATE:			DE
		ZIP:			19809

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MUNIVEST FUND II INC
		DATE OF NAME CHANGE:	19930714

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			JPMorgan Chase Bank, National Association
		CENTRAL INDEX KEY:			0000835271
		STANDARD INDUSTRIAL CLASSIFICATION:	ASSET-BACKED SECURITIES [6189]
		STATE OF INCORPORATION:			X1
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	811-07478
		FILM NUMBER:		111284172

	BUSINESS ADDRESS:	
		STREET 1:		1111 POLARIS PARKWAY
		CITY:			COLUMBUS
		STATE:			OH
		ZIP:			43240
		BUSINESS PHONE:		8009927169

	MAIL ADDRESS:	
		STREET 1:		1111 POLARIS PARKWAY
		CITY:			COLUMBUS
		STATE:			OH
		ZIP:			43240

	FORMER NAME:	
		FORMER CONFORMED NAME:	CHASE MANHATTAN BANK /NY/
		DATE OF NAME CHANGE:	19960911

	FORMER NAME:	
		FORMER CONFORMED NAME:	CHEMICAL BANK
		DATE OF NAME CHANGE:	19930521
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>c26320_3x0.xml
<DESCRIPTION>MAIN DOCUMENT DESCRIPTION
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0204</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2011-12-16</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000897269</issuerCik>
        <issuerName>BLACKROCK MUNIVEST FUND II INC</issuerName>
        <issuerTradingSymbol>MVT</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000835271</rptOwnerCik>
            <rptOwnerName>JPMorgan Chase Bank, National Association</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>270 PARK AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10017</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Series W-7 Variable Rate Muni Term Preferred Shares</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>1400</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <ownerSignature>
        <signatureName>/s/ Paul Palmeri, Managing Director</signatureName>
        <signatureDate>2011-12-28</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
