Filling pump

A filling pump is used for solving the technical problem that in the prior art, when a pump conveys fluid, the flow speed adjusting range is small. The filling pump comprises a pump body, a connecting ring, a driving assembly and an adjusting assembly. The pump body is provided with a liquid inlet channel, a liquid storage cavity and a liquid outlet channel in sequence according to the flow direction of liquid, plugging balls are arranged in the liquid inlet channel and the liquid outlet channel, and the plugging balls can slide along the liquid inlet channel or the liquid outlet channel so as to be used for plugging a liquid inlet of the liquid inlet channel or plugging a liquid inlet of the liquid outlet channel. A mounting cavity is formed in the pump body, the connecting ring is arranged in the mounting cavity, the connecting ring is fixedly connected with a piston rod, the piston rod is arranged in the liquid storage cavity in a penetrating mode, the piston rod is in sealing connection with the circumfer