The pneumatic dual -diaphragm pump uses compressed air, nitrogen or natural gas as power. The main set of (pneumatic) control valves allocate the compressed air to the gas chamber, and apply uniform pressure to the surface of the diaphragm. The gas discharged at the same time is discharged from the pump on the other side of the pump. The pneumatic dual -diaphragm pump drives into contact with the intervals of the mobilized dual -diaphragm pump with the mobilized dual -diaphragm pump of the diaphragm through the itinerary mechanical, and the mobile -oriented valve core. After the guide valve is activated, a pressure signal is sent to the other end of the main gas valve. The pneumatic double -proof membrane pump makes the compressed air direction changed to the other side of the inner chamber.