Michael Qualls and Marshawn Powell added 11 points each for the Razorbacks (14-8, 5-4 SEC), who connected on 49.1 percent of their shots from the floor, including 8-of-18 from 3-point range.
The victory was the first for Arkansas against a No. 2 team since 1999.
Leading scorer Kenny Boynton was held to just 10 points of 4-of-11 shooting for the Gators (18-3, 8-1), who were coming off a 78-64 win Saturday over then-No. 16 Mississippi.
Mike Rosario put in 15 points and Scottie Wilbekin added 14, seven rebounds and four assists for Florida.