Catalysis of the reaction: UDP-glucose + 5,7,3',4'-tetrahydroxyflavone = UDP + 7-O-beta-D-glucosyl-5,7,3',4'-tetrahydroxyflavone.
UDP-glucose:5,7,3\',4\'-tetrahydroxyflavone 7-O-beta-D-glucosyltransferase activity