Finch followed two deliveries later to give Muzarabani the respectable figures of 2-38 off four overs.
The 31-year-old also put on a record opening stand of 223 with fellow opener Short, bettering the 171-run stand between New Zealanders Martin Guptill and Kane Williamson against Pakistan in 2016.Australia posted 229-2 in their 20 overs.
The hosts saw out their innings at 9-129 as Andrew Tye picked up three wickets.
The 100-run victory was the biggest margin for Australia in T20Is.
He plundered 16 fours and 10 sixes in the highest individual innings in T20 global cricket, which only ended when he overbalanced chasing a wide one and hit wicket off the penultimate delivery of the innings.
"This innings is right up there".
Finch says he only has himself to blame for not playing at Test level. "It was nice to get a few in the middle and break the record".
Zimbabwe captain Hamilton Masakadza may be regretting his decision to send the visitors in. Since the winter of 2014, Finch's red-ball form has been stellar, with him averaging nearly 50 in both Australia and in England.
"The wicket played better than we thought". Remarkably, left-armer Tendai Chisoro conceded only 19 off his four overs. Finch broke his own record of 156 he scored against England in 2013.
He and Short perished in the last over.
The Victorian superstar was eventually dismissed in a freakish manner, chasing a wide delivery and accidentally hitting his own stumps inadvertently.
The third match of Australia and Pakistan in Zimbabwe T20I Tri-Series, 2018 is between Australia and Zimbabwe which is scheduled today.
Top scorer Solomon Mire (28) struck three fours and a six in Billy Stanlake's first over before falling in the tall fast bowler's next over.