50 Cent believes in tough love -- so he strapped on his boxing gloves and went toe-to-toe with the 11-year-old boy he's raising for a fighting lesson ... complete with some pretty stiff head shots.
The two threw hands in what appears to be 50's living room -- and the rapper connected with some shots that sent Davian flying back into the wall.
Despite the utter domination, 50 encouraged the kid to keep fighting -- "You're no quitter" -- and he responded with some pretty impressive combos of his own.