A Brooklyn high school cafeteria worker was busted Wednesday for punching a 16-year-old student during a squabble this week, cops said. 

The victim told police that Josette Sandy, 59, punched him in the head inside Clara Barton High School on Washington Avenue near President Street in Crown Heights, authorities said. 

She was arrested around 10:30 a.m. and charged with assault and harassment, cops said. 

The alleged assault stemmed from an argument between Sandy and the boy, police said. The nature of the clash is unclear. 

The teen complained of pain but suffered no serious injuries. He was taken to the Kings County Hospital Center as a precaution.