Double-diaphragm metering pump

The utility model discloses a double-diaphragm metering pump which comprises a front cover, a first diaphragm, a diaphragm reinforcing plate, a pressure gauge, a middle main body, a second diaphragm gland fixing shaft, a second diaphragm, a metering pump main body, a diaphragm push rod and a transmission case. The diaphragm of the metering pump is a consumable of soft tissue, due to many unknown factors, the service cycle and abnormal time of the diaphragm cannot be accurately judged, liquid leakage can be caused to trigger accidents due to the fact that the diaphragm is not found to be broken in time within unknown time, and when the first diaphragm is broken, the second diaphragm can continue to be used. And the pointer jumping on the pressure gauge represents the rupture of the first diaphragm, so that the problems of safety risk and liquid leakage caused by immediate leakage after the diaphragm of the original single-diaphragm metering pump is ruptured are well solved, a user can know the operation condit