The Brewers tied the record-holding 1979 and 1982 Milwaukee teams with the win.
Fielder's three home runs and five RBI helped propel the Brewers to a 6-4 victory. Rickie Weeks added a solo shot for Milwaukee and John Axford recorded his 46th save of the season to seal the win.
Fielder's three homers tied him with Matt Kemp for most home runs in the National League (38) and John Axford tied the National League save leader Craig Kimbrel at 46 saves.
Earlier this week the Brewers tied the franchise record for home wins and added to that record today, bringing their total home wins to 56.
The Brewers will attempt to set the franchise record for wins in a season in their final game of the year Tuesday night against the Pirates.