Novel automatic disassembly stop valve device

The utility model discloses a novel automatic dismounting stop valve device which comprises a bottle opening cover, the inner side of the top of the bottle opening cover is in threaded connection with a stop valve assembly, the stop valve assembly comprises a connecting plate, and the top of the connecting plate is fixedly provided with an operation assembly; the operation assembly comprises a second threaded cylinder, a third threaded cylinder, an operation ring, an expansion threaded cylinder and a clamping nut, and a pressure detector is movably clamped to the inner side of the expansion threaded cylinder. An operator rotates the operation ring to drive the pressure detector to move downwards, so that the push block at the lower end of the pressure detector pushes away the sealing plate, the detection end is in contact with gas in the gas cylinder for pressure detection, detection is convenient, and the detection end directly extends into the gas cylinder for detection, so that after the pressure detector