    <SEC-DOCUMENT>0001193125-22-187873-index.html : 20220705
    <SEC-HEADER>0001193125-22-187873.hdr.sgml : 20220705
    <ACCEPTANCE-DATETIME>20220705150639
    ACCESSION NUMBER:		0001193125-22-187873
    CONFORMED SUBMISSION TYPE:	N-CSR
    PUBLIC DOCUMENT COUNT:		20
    CONFORMED PERIOD OF REPORT:	20220430
    FILED AS OF DATE:		20220705
    DATE AS OF CHANGE:		20220705
    EFFECTIVENESS DATE:		20220705

    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:		221064343

    	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>d314893dncsr.htm
    <DESCRIPTION>BLACKROCK MUNIVEST FUND II, INC.
    <TEXT>
    Document 1 - file: d314893dncsr.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.CERT
    <SEQUENCE>2
    <FILENAME>d314893dex99cert.htm
    <DESCRIPTION>CERTIFICATIONS PURSUANT TO SECTION 302
    <TEXT>
    Document 2 - file: d314893dex99cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.906 CERT
    <SEQUENCE>3
    <FILENAME>d314893dex99906cert.htm
    <DESCRIPTION>CERTIFICATIONS PURSUANT TO SECTION 906
    <TEXT>
    Document 3 - file: d314893dex99906cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.PROXYPOL
    <SEQUENCE>4
    <FILENAME>d314893dex99proxypol.htm
    <DESCRIPTION>PROXY VOTING POLICY
    <TEXT>
    Document 4 - file: d314893dex99proxypol.htm

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    <DOCUMENT>
    <TYPE>EX-99.GLOBAL.CORP.GO
    <SEQUENCE>5
    <FILENAME>d314893dex99globalcorpgo.htm
    <DESCRIPTION>GLOBAL CORPORATE GOVERNANCE & ENGAGEMENT PRINCIPLES
    <TEXT>
    Document 5 - file: d314893dex99globalcorpgo.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.US.CORP.GOV
    <SEQUENCE>6
    <FILENAME>d314893dex99uscorpgov.htm
    <DESCRIPTION>CORPORATE GOVERNANCE AND PROXY VOTING GUIDELINES FOR U.S. SECURITIES
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    Document 6 - file: d314893dex99uscorpgov.htm

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    <DESCRIPTION>GRAPHIC
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    Document 7 - file: g296837g21b31.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 8 - file: g296837g3.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 9 - file: g296837g33g19.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 10 - file: g296837g42l24.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 11 - file: g296837g46a05.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 12 - file: g305539g42l24.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 13 - file: g305539leaf.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 14 - file: g305539photo_01mips.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 15 - file: g305539sig_01mips.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 16 - file: g305539sp12.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 17 - file: g305539sp15.jpg

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    <DESCRIPTION>GRAPHIC
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    Document 18 - file: g305539sp4.jpg

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    <SEQUENCE>19
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    <DESCRIPTION>GRAPHIC
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    Document 19 - file: g305539sp6.jpg

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    <DESCRIPTION>GRAPHIC
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