French teacher J Renaud Felix accused the student of cheating and kicked him out of class on Tuesday morning, according to police.
But the 14-year-old student walked back into class and sat down at his desk. When the teacher left the room to find security, the student followed him and attacked, police said.
Authorities said the student proceeded to punch, kick and stomp on the teacher all over his upper torso and head.
The French teacher sustained a concussion during the beating. He was taken to Nassau University Medical Center, where he was treated and released.
The student will be charged as a juvenile, prosecutors said. He is due in family court on Wednesday.
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