Janet Skelly, head of Birkenhead Preparatory School, said Beyblades seemed like a good idea at first.
She said they were popular with kids who didn't want to play football or basketball at break.
But after hearing that a parent was hit in the eye by a top, Janet decided to ban them.
She said: "We've got to put the safety and wellbeing of the boys first."
The injuries apparently happen when Beyblades are released in the air rather than on the ground (how they're designed to be used).