    <SEC-DOCUMENT>0001193125-19-190278-index.html : 20190708
    <SEC-HEADER>0001193125-19-190278.hdr.sgml : 20190708
    <ACCEPTANCE-DATETIME>20190708114641
    ACCESSION NUMBER:		0001193125-19-190278
    CONFORMED SUBMISSION TYPE:	N-CSR
    PUBLIC DOCUMENT COUNT:		23
    CONFORMED PERIOD OF REPORT:	20190430
    FILED AS OF DATE:		20190708
    DATE AS OF CHANGE:		20190708
    EFFECTIVENESS DATE:		20190708

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			BLACKROCK MUNIVEST FUND II, INC.
    		CENTRAL INDEX KEY:			0000897269
    		IRS NUMBER:				223220659
    		STATE OF INCORPORATION:			MD
    		FISCAL YEAR END:			1031

    	FILING VALUES:
    		FORM TYPE:		N-CSR
    		SEC ACT:		1940 Act
    		SEC FILE NUMBER:	811-07478
    		FILM NUMBER:		19944648

    	BUSINESS ADDRESS:
    		STREET 1:		100 BELLEVUE PARKWAY
    		CITY:			WILMINGTON
    		STATE:			DE
    		ZIP:			19809
    		BUSINESS PHONE:		800-441-7762

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

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	BLACKROCK MUNIVEST FUND II INC
    		DATE OF NAME CHANGE:	20061026

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	MUNIVEST FUND II INC
    		DATE OF NAME CHANGE:	19930714
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>N-CSR
    <SEQUENCE>1
    <FILENAME>d657033dncsr.htm
    <DESCRIPTION>BLACKROCK MUNIVEST FUND II, INC.
    <TEXT>
    Document 1 - file: d657033dncsr.htm

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    <DOCUMENT>
    <TYPE>EX-99.CERT
    <SEQUENCE>2
    <FILENAME>d657033dex99cert.htm
    <DESCRIPTION>CERTIFICATIONS PURSUANT TO SECTION 302
    <TEXT>
    Document 2 - file: d657033dex99cert.htm

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    <DOCUMENT>
    <TYPE>EX-99.906 CERT
    <SEQUENCE>3
    <FILENAME>d657033dex99906cert.htm
    <DESCRIPTION>CERTIFICATIONS PURSUANT TO SECTION 906
    <TEXT>
    Document 3 - file: d657033dex99906cert.htm

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    <TYPE>EX-99.PROXY.POL
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    <DESCRIPTION>CLOSED-END FUND PROXY VOTING POLICY
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