Practical fan bearing self-cooling system

In order to improve the cooling efficiency, the utility model provides a practical fan bearing self-cooling system which comprises a workbench, a fan and a motor, a fan rotating shaft and an output shaft of the motor are coaxial and are connected through a coupler, a shaft seat is arranged on the workbench, a bearing for supporting the fan rotating shaft and the output shaft of the motor to rotate is arranged on the shaft seat, and the motor is arranged on the bearing. The temperature sensor is used for reflecting the temperature of the bearing, the control valve is used for controlling the on-off of the air taking pipe, the controller is used for controlling the on-off of the control valve, one end of the air taking pipe is communicated with the air outlet of the fan, and the other end of the air taking pipe is communicated with the cooling ring pipe; a cooling ring pipe is arranged on one side of each bearing and is coaxial with the corresponding bearing, a plurality of cooling holes are evenly formed in th