Automobile hub bearing finished product broaching protection device

The utility model discloses a broaching protection device for an automobile hub bearing finished product. The broaching protection device comprises the hub bearing finished product and a protection mechanism. The protection mechanism is arranged at the top of the hub bearing finished product; the lower part of the hub bearing finished product is connected with a fixed seat; the lower part of the fixed seat is connected with a machine tool base through a bolt; a magnetic sealing ring is arranged in the end face of the inner side of the upper portion of the hub bearing finished product. The air cylinder drives the pressing plate to press downwards, so that the O-shaped sealing ring arranged in the protective cover on the pressing plate and the inner side end face of the hub bearing are closed for sealing, in the broaching process, it can be guaranteed that a broach has sufficient lubrication and heat dissipation, the inner side magnetic sealing ring can be prevented from being stained with broaching oil and bei