No. Sports betting is not legal in Wisconsin and there is no legislation in the works.
While there are lawmakers who have pushed for sports betting, it remains easier said than done. The biggest issue facing Wisconsin is that to legalize sports betting, the state would need to renegotiate their compacts with tribes, and the tribes have no desire to change those.
There is a chance legal proceedings are written to allow sports betting, but they would need to go through the usual process of passing the Assembly and Senate in two consecutive sessions before going to a statewide referendum. It's a long process that's unlikely to be solved before 2021.
As a positive, Daily Fantasy Sports and horse racing betting are allowed in the state. Legislation has been introduced to officially regulate fantasy sports numerous times but nothing has passed. Since most in Wisconsin consider them games of skill, fantasy sites like DraftKings and FanDuel are allowed to operate freely.