The Rocket had missed an attempt at a 147 earlier in the week and said he wanted to complete the feat "for the fans."
In the end, he chose the perfect time to hit his 12th career maximum, as he clinched his second title of the year with a superb clearance.
O'Sullivan hadn't picked up a cue since the Masters in January - another tournament he won with a six-frame margin in the final - but was untroubled all week as he racked up convincing wins in every round.
"I thought on about 48 the maximum was on. I looked at the scoreboard and saw it was all blacks," O'Sullivan said after the game.
"I have made 11 [maximums] right handed, so this counts as a left-handed 147. I couldn't have got on the final black any better.
"Once I start slowing down, I hope Ding dominates. He plays the game as it should and people should enjoy him."
The 38-year-old will next be in action during the Players Championship, before he attempts to win his sixth World Championship in April - which would also be his third in a row.
Can anyone stop O'Sullivan this season?
image: © dsykes34