Lil Uzi Vert Shows Off Fast Hands In Boxing Training Session

Lil Uzi Vert looks like he'd give the Lil Uzi Hurt in the ring ... 'cause the superstar rapper just shared footage of his most recent boxing sesh -- and the dude has HANDS!!!

The 26-year-old Philly native showed off his serious skills while hitting the accuracy pads with a trainer ... saying, "Becoming a better me."

Of course, the timing of the video is interesting -- Uzi called out YK Osiris for a fight last year ... and most recently, Soulja Boy said he'd take on any rapper in the game in a boxing match.

FYI -- Osiris, who is 5'9", previously said he would not fight the 5'4" Uzi due to his height.

Uzi may have to wait in line if he wants the "Pretty Boy Swag" rapper, though -- as we…