The utility model discloses a classification wheel structure which comprises a machine head and a wheel body. A main shaft is arranged in the machine head and connected with a motor on the top of the machine head. The main shaft and a shaft sleeve are connected through three bearings. A feed inlet is connected with one side of the machine head. The bottom of the machine head is connected with the wheel body through a connecting disk. 90 blades are evenly distributed on the wheel body. The motor drives the wheel body to rotate. Silicon carbide particles of particle diameters within a certain range are sucked in from the feed inlet, fly out from the space between the blades of the wheel body and then fall into a collection bag. The classification wheel structure is more stable and resistant to wear, the service life of the main shaft is prolonged, the main shaft and the wheel body are replaced at the same time, and the production cost is reduced.