The Badgers turned a 47-41 halftime lead into a 21-point victory by outscoring the Illini 41-26 in the final 17 minutes.
John Tonje led Wisconsin again with a stellar 31-point performance, making it his second 30-plus scoring game.
Steven Crowl tallied a season-high 20 points with seven boards.
John Blackwell also scored in double figures with 16 and pulled down six boards.
Wisconsin (21-5) will play Oregon at home on Saturday starting at 11 s.m.
