Straight-through pneumatic shutoff valve

The utility model relates to the technical field of valves, and particularly discloses a straight-through pneumatic shutoff valve which comprises a shell and a plunger. The shell is provided with a first flow channel; the plunger is arranged in the first flow channel in a sliding manner; a pressure regulating cavity is formed in the shell, the plunger is provided with a sliding part, and the sliding part is assembled in the pressure regulating cavity; the shell is provided with a first air inlet channel and a second air inlet channel, the sliding part moves in the axial direction along the pressure adjusting cavity according to the air pressure in the pressure adjusting cavity, and then opening and closing of the valve are achieved. A first connecting pipe and a second connecting pipe are arranged outside the shell, the first connecting pipe and the second connecting pipe are communicated with the first air inlet channel and the second air inlet channel respectively, and a detection device is arranged on the