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A hulking Queens gym teacher and former college football player claims a pupil fractured his ankle, injured his knee and forced him to go to a shrink for stress — even though the kid was only 50 pounds and in first grade.

Burly, 220-pound PS 330 teacher John Webster, 27, said a 4-foot-2 Rodrigo Carpio, 6, also kicked and pinched the Elmhurst school’s principal, a security officer and another teacher during a rampage in April.

“It’s sort of like an angel-devil sort of thing,” said the 5-foot-10 Webster, who recently filed a notice of his intent to sue the city and says he must now wear braces on his right ankle and knee.

“[Rodrigo] looks like an angel, but then, all of a sudden, that halo turns into horns. It’s been a nightmare. It’s embarrassing. It’s humiliating.”

But Rodrigo’s dad, Jorge Carpio, 44, scoffed: “The lawsuit is totally absurd. How could my little boy do so much damage? My poor son.”

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