The invention discloses a gas plug valve. The gas plug valve comprises a valve core with a gas distribution cavity; a valve rod driving the valve core to rotate is inserted into one axial end of the gas distribution cavity and can be axially moved relative to the valve core and pressed down for realizing ignition; an air inlet is formed in the other axial end of the gas distribution cavity, an inner ring gas supply hole and an outer ring gas supply hole both communicating with the gas distribution cavity are sequentially formed in the side wall of the valve core in the axial direction, and an annular table located between the inner ring gas supply hole and the outer ring gas supply hole is arranged on the inner wall of the gas distribution cavity; and the valve rod is provided with seal washers abutting against the annular table in the pressed-down ignition mode, and the one, away from the gas inlet hole, of the inner ring gas supply hole and the outer ring gas supply hole and the gas inlet hole are blocked by the seal washers and do not communicate with each other in the pressed-down ignition mode. According to the gas plug valve, one of the inner ring gas supply hole and the outer ring gas supply hole and the gas inlet hole are blocked by the seal washers and do not communicate with each other when the valve rod is pressed down for ignition, the total gas output quantity is reduced, and detonation does not occur even if ignition does not succeed.