Gas self-closing valve

The utility model provides a gas self-closing valve, and belongs to the technical field of valves. The gas self-closing valve solves the problems that an existing gas self-closing valve is inconvenient to assemble, poor in use reliability and the like. The gas self-closing valve comprises a valve body, a valve hole is formed in the valve body, a valve element is installed at the position of the valve hole, a valve control mechanism capable of controlling the valve element to open and close the valve hole according to changes of air pressure in the valve body is arranged in the valve body, the valve control mechanism comprises a pull rod capable of ascending and descending vertically, and a valve control piece capable of swinging vertically is hinged to the lower end of the pull rod. A guide seat located on one side of the valve hole is integrally arranged in the valve body, a guide groove is formed in the upper end face of the guide seat, the side, close to the valve hole, of the guide groove penetrates throu