JOHANNESBURG, December 1, 2013 (AFP) - The Johannesburg native did not record a bogey over the final three rounds as he followed up on his 12 shot victory on the Leopard Creek par-72 layout last year with another strong showing on home soil.
It is his third victory at Malalane, Mpumalanga after defeating England's Neil Cheetham in a playoff in 2004.
The tournament also marked the second tournament in the 2014 Road to Dubai.
His final score of 17 under was too good for Finch and the rest of the field although the 36-year-old from Hull will take heart from his best result of the year that will certainly improve his initial ranking of 441st in the world.
"I had a bit of a hiccup during my first round at the 17th but after that I played almost flawless golf with no bogeys," said the champion.
"If you play some 60 holes without making a bogey, then hopefully you're going to win.
"I've been putting well all week and I thought a 67 or 68 would be good enough today so I'm very pleased."
Finch had drawn level on the third hole of the final round with two birdies, but Schwartzel refused to budge and hit back with three birdies on the front nine before the Englishman creaked under the pressure.
A bogey at the par-four 11th followed by a double bogey on 14 was his undoing as the South African completed his third bogey free round in succession and racked up 20 birdies in 72 holes.
Fellow Englishman Simon Dyson carded a final round 67 to share third place with compatriot Ross Fischer and Frenchman Romain Wattel on 10 under, while Dane Soren Hansen was one shot further back in sixth.
Former world number six Schwartzel, who won his solitary major at the 2011 Masters, was in dazzling form and carried on from his performance last week when he lost the South African Open in a playoff to Denmark's Morten Orum Madsen.
That win was Madsen's first win on the European Tour and he shared the overnight lead with Schwartzel after two rounds only to fall out of contention with a third round 79.
He finished the tournament on four under after recovering on the last day with a 69.
Leading scores after the fourth and final round of the Alfred Dunhill Championship on Sunday at the par-72, 6,665-metre Leopard Creek Country Club (GBR & IRL unless stated, par 72):
271 - Charl Schwartzel (RSA) 68-68-67-68
275 - Richard Finch 68-70-67-70
278 - Romain Wattel (FRA) 70-69-68-71, Simon Dyson 72-69-70-67, Ross Fisher 72-65-72-69
279 - Soren Hansen (DEN) 72-65-71-71
280 - Magnus A Carlsson (SWE) 70-72-72-66, Simon Wakefield 74-68-70-68
281 - Danny Willett 69-70-73-69, Warren Abery (RSA) 73-71-69-68
282 - Andrea Pavan (ITA) 72-71-74-65, David Drysdale 68-72-72-70
283 - Garrick Porteous 71-69-74-69, Andy Sullivan 71-72-70-70, Victor Riu (FRA) 68-71-67-76
284 - Morten Orum Madsen (DEN) 65-71-79-69, James Kingston (RSA) 69-74-70-71, Ricardo Santos (POR) 66-74-72-72, Allan Versfeld (RSA) 66-77-69-72, Lucas Bjerregaard (DEN) 72-72-67-73, Brendon De Jonge (ZIM) 73-69-68-74, Tyrone Van Aswegen (RSA) 70-68-72-74