You've seen him crush the mitts ... but now 7-year-old boxing phenom Nijee "The Future" is obliterating real life sparring partners -- and they're all WAY OLDER THAN HIM.
After bursting onto the scene with a YouTube video that racked up more than 1 MILLION views, Nijee is now training with real opponents ... but his dad says he'll only put him in the ring with older kids -- for their own safety.
Check out this recent video (above) and you'll see why -- Nijee delivers a series of devastating body shots on a kid two years older than him ... putting an end to the session.
We're told the other kid is no chump -- he's a respected 9-year-old fighter who's "very experienced" and has been training for a while.
Not to worry parents ... the two tykes hugged and shook hands after the fight.
Question is ... when will Nijee fight for real?? We're told USA Boxing requires fighters to be at least 8 years old to compete in a sanctioned bout. So, soon.
In the meantime, check out Nijee working below ... and hide your kids.