    <SEC-DOCUMENT>0001193125-19-002476-index.html : 20190104
    <SEC-HEADER>0001193125-19-002476.hdr.sgml : 20190104
    <ACCEPTANCE-DATETIME>20190104154744
    ACCESSION NUMBER:		0001193125-19-002476
    CONFORMED SUBMISSION TYPE:	N-CSRS
    PUBLIC DOCUMENT COUNT:		16
    CONFORMED PERIOD OF REPORT:	20181031
    FILED AS OF DATE:		20190104
    DATE AS OF CHANGE:		20190104
    EFFECTIVENESS DATE:		20190104

    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-CSRS
    		SEC ACT:		1940 Act
    		SEC FILE NUMBER:	811-07478
    		FILM NUMBER:		19509830

    	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-CSRS
    <SEQUENCE>1
    <FILENAME>d628553dncsrs.htm
    <DESCRIPTION>BLACKROCK MUNIVEST FUND II, INC.
    <TEXT>
    Document 1 - file: d628553dncsrs.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.CERT
    <SEQUENCE>2
    <FILENAME>d628553dex99cert.htm
    <DESCRIPTION>CERTIFICATIONS PURSUANT TO SECTION 302
    <TEXT>
    Document 2 - file: d628553dex99cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.906CERT
    <SEQUENCE>3
    <FILENAME>d628553dex99906cert.htm
    <DESCRIPTION>CERTIFICATIONS PURSUANT TO SECTION 906
    <TEXT>
    Document 3 - file: d628553dex99906cert.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>g627246g09g62.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: g627246g09g62.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>g627246g09h65.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 5 - file: g627246g09h65.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>g627246g41l68.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: g627246g41l68.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>g627246g44u23.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: g627246g44u23.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>g627246g51n99.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: g627246g51n99.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>g627246g60p62.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: g627246g60p62.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>g627246g62e83.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 10 - file: g627246g62e83.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>g627246g65b16.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 11 - file: g627246g65b16.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>g627246g83y23.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 12 - file: g627246g83y23.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>g627246g98u13.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 13 - file: g627246g98u13.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>14
    <FILENAME>g627246leaf.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 14 - file: g627246leaf.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>15
    <FILENAME>g630663photo_01mips.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 15 - file: g630663photo_01mips.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>16
    <FILENAME>g630663sig_01mips.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 16 - file: g630663sig_01mips.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>