Johnnie Jackson grabbed the crucial goal in injury time, and Wiggins is hopeful that the Addicks can use the result to turn their season around.
"It was a massive win. To beat QPR, one of the promotion favourites, shows what we can do and has given us all a massive boost," Wiggins is quoted as saying by the Daily Star.
"On the back of this win I can't see why we can't go here and get a win and hopefully that will give us a lift for the rest of the season."
Charlton, who are 22nd in the league, play Leicester City in their next Championship match.