It happened on Friday morning at the school on the Shore Road.
The boy was treated in the Royal Victoria Hospital in Belfast and later discharged.
Police said they were investigating the incident and said staff and pupils at the school were co-operating fully with the police investigation.
The PSNI added that how the pupil came by his injuries was still being investigated.
They appealed to anyone with information to contact police or members of the school staff.
A schoolboy has been taken to hospital after an incident at Belfast High School at Jordanstown in Newtownabbey.