Gas safety emergency cut-off valve

The utility model discloses a fuel gas safety emergency cut-off valve, which relates to the technical field of fuel gas cut-off valves and comprises a valve body, a shell is fixedly mounted on the valve body, a fixing block is arranged on the inner wall of the shell, a positioning block is rotatably connected in the fixing block, a filter screen on the inner side of the positioning block is connected with a threaded valve rod, and the threaded valve rod is connected with the valve body. One side of the positioning block is fixedly connected with a connecting sleeve, one end of the connecting sleeve is provided with a first gear, the shell is provided with a driving part for driving the first gear to rotate, one side of the shell is movably connected with a transmission shaft, the transmission shaft is fixedly provided with a third gear, and the third gear is matched with the first gear. The cut-off valve has the advantages that the cut-off valve can be opened and closed in two modes, so that after a common el