Safety valve capable of quickly releasing pressure

The utility model discloses a quick pressure relief safety valve which comprises a valve body, the bottom of the inner side wall of the valve body is provided with a threaded groove, the middle of the inner top wall of the valve body is in threaded connection with a screw rod, and one end of the screw rod is rotationally connected with a piston. According to the safety valve capable of rapidly relieving pressure, through the arrangement of the screw rod, the piston, the spring, the shifting piece, the contact switch and the alarm module, when the pressure in the valve body is too large, the piston moves upwards under the action of the pressure, so that an opening of the pressure relief pipe is opened, pressure relief is conducted on a pipeline, and the pressure relief speed of the safety valve is increased; when the piston moves, the screw rod in the middle of the upper surface of the piston rotates upwards along with the piston, and the shifting piece on the top of the outer surface of the screw rod is in co