With a year to run on his current deal, the two-year extension ensures Finch will remain with the Renegades until at least the end of BBL|10.
The 31 year old has played 46 games with the Renegades.
Captain of the club since BBL|02, Finch has won four Player of the Season awards and amassed 1,669 runs at a strike rate of 139.
Finch became the first Renegade to blast a Big Bash century when he smashed 111 not out against Melbourne Stars in 2012.
Earlier this week Finch broke his own record for the highest individual score in a T20I when he hit 172 off 76 balls against Zimbabwe.