Pneumatic diaphragm pump with cavity buffer

The utility model provides a pneumatic diaphragm pump with cavity buffer, comprising a pneumatic room, a working chamber, a feed port, a discharge port, a gas inlet and a gas outlet; a cavity buffer is arranged on the corresponding point of the discharge port, and the opening of the cavity buffer is communicated with the channel of the discharge port; the volume of the cavity buffer is that the output flux is from 1:25 to 35, and the unit of the output flux is L/ min. The structure of the original pneumatic diaphragm pump is not changed in the utility model with simple structure, and the combination of the utility model and the original structure is convenient; the three-way structure of the original discharge port is used for installing the cavity buffer on an indwelling opening in a pneumatic double diaphragm pump, and a three-way structural member is arranged on the discharge port of a pneumatic single diaphragm pump, which realizes the smooth output of the discharging material and improves the working performance of the host.