Selective automatic release device for canned compressed gas

The utility model provides a canned compressed gas selective automatic release device which comprises an upper fixing panel and a hollow control box body which are arranged up and down, the upper fixing panel is connected with a control system through a connecting cylinder, a plurality of notches are evenly distributed in the upper fixing panel, and spring pieces with the same number are arrangedon the top face of the control box body. A center shaft capable of rotating and moving up and down is arranged in the connecting cylinder, a cross arm, a coded disc, a large gear and a chassis are installed on the center shaft, and an air inlet cover is arranged on the cross arm; a single-chip microcomputer control system, a steering engine, a servo motor, a cam and a spring are arranged in the control box body, and the spring is in contact with the chassis; the cam is located above the large gear and makes contact with the upper end face of the large gear. The automatic release device can selectively release differen