The native of Petite-Riviere-St Francois, Que., clinched the Crystal Globe after winning a World Cup event Tuesday.
A silver medallist last month at the Sochi Olympics, Maltais edged Nelly Moenne Loccoz of France and Alexandra Jekova of Bulgaria to secure her fifth career overall title.
"My goal coming here was clear — to come back with a win and clinch the Crystal Globe," said Maltais. "Right now, it's like I'm on a cloud. I had a wonderful season. Actually, my last four seasons have been amazing, and I keep improving."
American Lindsey Jacobellis is second in the overall standings after finishing sixth Tuesday.
"I didn't get off to good starts in the quarter-final or the semifinal, but I knew I was fast in the rest of the course," said Maltais. "In the final, it was rough but I knew I was going for the win. I knew I could do it. My riding is really amazing right now. I can't believe how well things are going for me."
Maltais will close out the season later this week in Spain.
"I'll try to do it again in the last race," she said. "And I'll use it to test some equipment for next season."
The 33-year-old said she hasn't decided if she will return next season.
"I"m going to take a little rest," she said. "I haven't made a decision on next season yet, but personally, I'd like to race another season just to make the transition smoother."
Michelle Brodeur of Calgary, Carle Brenneman of Whistler, B.C., and Tess Critchlow of Kelowna, B.C., and Zoe Bergermann of Acton, Ont., didn't make it past the quarter-finals.
On the men's side, Christopher Robanske of Calgary won the bronze, finishing behind gold medallist Fabio Cordi of Italy and Finland's Anton Lindfors of Finland.
Kevin Hill of Vernon, B.C., was 12th. Baptiste Brochu of Saguenay, Que., Jake Holden of Caledon, Ont., Rob Fagan of Squamish, B.C., didn't make it past the quarter-finals.