Gate valve capable of preventing and controlling locking

The utility model discloses a prevention and control locking gate valve which comprises a valve shell and connecting flanges, the connecting flanges are arranged at the left end and the right end of the valve shell respectively, an upper valve rod is arranged on the upper side of the valve shell, connecting plates are arranged at the lower end of the upper valve rod and the upper end of the valve shell respectively, and the two connecting plates are connected and fixed through fixing bolts. The protection device is arranged at the front end of an existing locking device, the protection device is composed of the protection sleeve, the protection cover, the fixing pieces and the sliding grooves, the fixing pieces are arranged on the left side and the right side of the upper end of the protection cover and can slide in the sliding grooves in the protection sleeve, the protection sleeve is arranged at the front end of the protection device in a sleeving mode, and the lock cylinder is protected; the whole protecti