Locking control system and control method of fan impeller and fan

The invention provides a fan impeller locking control system, a fan impeller locking control method and a fan. The fan comprises a locking disc, a gear box and a lock pin. The locking disc is connected with the gear box, and the gear box is used for driving the locking disc to rotate; the lock pin is used for being matched with the positioning hole of the locking disc to achieve positioning of the locking disc. The system comprises a driving part and a controller, the driving part is connected with the controller; when the fan impeller is in a static state, the controller controls the driving part to be matched with the gear box and drives the gear box to rotate, and alignment of the positioning hole and the lock pin is achieved. By arranging the active driving device, a unit in a shutdown maintenance state or a fault state can actively rotate, the relative position of the lock pin and the positioning hole can be adjusted, rapid alignment of the lock pin and the positioning hole is achieved, and the problem t