Coaxiality detecting tool of car hub bearing hole

The invention discloses a coaxiality detecting tool of a car hub bearing hole. The coaxiality detecting tool of the car hub bearing hole comprises a base assembly. A positioning shaft used for installing a hub to be detected in a sleeved is fixed on the base assembly. A measuring lever is connected to the base assembly in a rotation mode. One end of the measuring lever penetrates into a bearing hole of the hub to be detected and adhered to the inner wall of the bearing hole. The other end of the measuring lever transmits torque of the measuring lever to a measuring head of an instrument fixedly arranged on the base assembly. When the detecting tool works, the hub to be detected is sleeved onto the positioning shaft and thus, the lower end of the measuring lever is adhered to the inner wall of the bearing hole. The hub to be detected is rotated, and a displacement amount is transmitted to the measuring head of the instrument through the measuring lever and eventually displayed on the instrument. According to the detecting tool, the measuring rod is used for feeding back a testing result to the instrument, precision in measuring is improved, the structure is simple and reliable and operation is convenient.