The invention belongs to the technical field of metering pumps and particularly relates to an electromagnetic diaphragm metering pump. The pump comprises a pump body, a diaphragm, a pump cavity, a metal filter net, a discharging pump head, a first ball, a feeding pump head, a second ball, a threaded column, a worm wheel, a screw barrel, a worm, a mounting plate, barrels, column bodies, a bottom plate, a base, a piston, a piston cavity, an electromagnetic push rod, a piston column and worm mounting plates. The electromagnetic diaphragm metering pump is simple in structure and convenient to maintain and use, the metal filter net is mounted on the pump, particles in liquid materials can be effectively prevented from making contact with the diaphragm, the probability of damage of the diaphragmis greatly reduced, and the service life of the pump can be guaranteed easily; and a height adjusting mechanism is contained in the pump, when the pump is mounted and used, the height of the pump canbe adjusted through the height adjusting mechanism, no gasket is needed, accordingly, the feeding pump head of the pump can be connected with an output end of an external storage device conveniently,and using of the pump is greatly facilitated.