The Nuggets led by only two points starting the final quarter, but Robinson drained a pair of 3-pointers with in the first 2 minutes and went on to register two more treys, helping Denver pull away.
He finished with five 3-pointers overall while Timofey Mozgov added 16 points and 15 rebounds for the Nuggets, who reeled off a fifth straight win beginning a six-game road trip.
Ty Lawson also netted 16 points and Kenneth Faried added 12 with 13 rebounds.
Rudy Gay supplied 23 points and nine rebounds for the Raptors, who fell for a third straight time at home.
Jonas Valanciunas chipped in 18 points and 11 rebounds.