A video camera captured the incident from Friday night's game between Hamburg High School and Annville-Cleona High School in Lebanon County.
Police say Hamburg's quarterback, Joe Cominsky, ripped off an opposing player's helmet and used it to hit the player twice in the head.
The victim, Josh Hartman, walked away with minor injuries.
It is still unclear what provoked the attack.
Both players were ejected from the game and will serve a one-game suspension.