A hockey player from an adult league in Canada straight-up kicked an opponent in the face with his skate during a mid-game scuffle ... and the incident was so reckless, police now tell TMZ Sports they're investigating it all.
The scary scene happened during an Adult Safe Hockey League game on July 29th at Scotia Barn in Burnaby.
You can see in the video from the arena, two players from opposing teams were fighting each other in the 3rd period ... when, suddenly, one of the guys appeared to intentionally kick the other with the blade of his skate.