Valve locking protection device

The utility model discloses a valve locking protection device which comprises a valve pipe, flanges are fixedly installed at the two ends of the valve pipe respectively, a partition plate is fixedly installed in the valve pipe, a through hole is formed in the surface of the partition plate, a sealing piece is installed above the through hole in a sliding mode, a tightening screw is installed on the surface of the valve pipe in a threaded mode, and a first hand wheel is fixedly installed at the top end of the tightening screw. The bottom end of the tightening screw extends into the valve pipe and is fixedly connected with the sealing piece, a supporting frame is fixedly installed on the surface of the valve pipe, a protection assembly is arranged in the middle of the supporting frame, the supporting nut is protected through the protection assembly, a square groove is formed in the middle of the supporting frame, and a blocking piece is slidably installed in the square groove. The blocking piece abuts against t