The invention discloses a large air valve. The large air valve comprises a main valve body which is externally fixed with a 51-single chip microcomputer; the corners of the main valve body are all treated through a rounding technology; an air inlet pipeline connector is arranged at the upper end in the main valve body; an air inlet pipeline structure is arranged at the position, at the bottom of the air inlet pipeline connector, of the main valve body; valve core space is formed in the position, at the bottom of the air inlet pipeline structure, in the main valve body; second valve core plate placement space is formed in the position, which is perpendicular to the valve core space, in the main valve body; and first valve core plate placement space is formed in the position, on one side of the valve core space, in the main valve body. The large air valve is arranged perpendicular to an air direction by utilizing interelectromagnetic acting force, so that the phenomena of difficulties in movement caused by air pressure is effectively reduced; and in addition, the electromagnetism has the capacity of reversing quickly, so that opening or closing can be realized quickly, and the electromagnetism has instantaneity.