The Swede entered Sunday seven shots off the lead, but eight birdies in his first 16 holes had him in a tie for top spot before he produced one of the great moments on Wentworth Club's famous 18th.
He put his second shot to six feet to send the bumper crowd into raptures and the resulting eagle putt handed him a two-shot lead, piling the pressure on the chasing pack.
After three days of glorious sunshine on the revamped West Course, heavy rain began to fall as the final groups made the turn, but nobody could stop Noren claiming an ultimately convincing ninth European Tour victory.
The 62 was also Noren's joint-lowest round on Tour and was reminiscent of the 2016 season's Nedbank Golf Challenge hosted by Gary Player where he finished with a 63 to win a fourth event of the year.Noren made a bright start with gains on the first, second, fourth and seventh helping him reach the turn in 31. The 34 year old added a hat-trick of gains from the 12th and when he rolled a stunning effort left-to-right up the hill on the 16th, he shared the lead before his big finish.
"It feels amazing and crazy because I had no intention of trying to win this morning," said Noren, who had won five of his previous 17 European Tour events. "I didn't even think about it when I came off the course quite angry yesterday after playing a good round and chipping it into the water from the back of the green on 18. It's a great feeling now but it feels unreal."