By TMZ

Middleweight contender Peter "Kid Chocolate" Quillin ﻿is making his silver screen debut next year -- as none other than the original Black Mamba himself Roger Mayweather ... TMZ Sports has learned.

Quillin tells us ﻿he auditioned, and landed the small role in an upcoming flick entitled "Bleed For This" -- a true-life story centered around the life of world champion boxer Vinny Pazienza, played by "Divergent" actor Miles Teller.

"Only Roger Mayweather can be Roger Mayweather," Quillin says ... "What I tried to do is bring a fighter's mentality to his character."

The 31-year-old champ says the hardest part of the job was nailing down the fight choreography -- since he's not used to scripting out his moves in the ring -- but says there's one part of the gig that came naturally.

"I remembered all of my lines. I didn't f*** up."