Intermediate body for dual-output and dual-input integral pneumatic diaphragm pump

The invention discloses an intermediate body for a dual-output and dual-input integral pneumatic diaphragm pump. The intermediate body comprises a center body. A center hole and an air valve mounting hole are formed in the center body. A center shaft is sleeved with the center hole. An air valve capable of controlling the center shaft to move left and right is sleeved with the air valve mounting hole. Diaphragm pieces are fixed to the two ends of the center shaft respectively. Two independent water inlet channels are formed at the bottom of the center body, and two independent water outlet channels are formed at the top of the center body. After the intermediate body is adopted, the pneumatic diaphragm pump can be used for drawing of two products at the same time; and due to the fact that the number of assembly pieces is reduced, the leakage probability is lowered, and the intermediate body can be used for high-corrosivity liquid such as sulfuric acid.