Low-noise reciprocating pump

The invention relates to a low-noise reciprocating pump which comprises an upper cover, a sound insulation cover and a base, a mounting seat is arranged in the sound insulation cover, a motor is fixed in the mounting seat, one end of a rotating shaft is fixed to the output end of the motor, the other end of the rotating shaft penetrates through a cam and extends upwards to be fixedly connected with a plurality of fan blades, and the part, penetrating through the cam, of the rotating shaft is located on one side of the center of the cam. A plurality of pump body units are evenly fixed to the inner wall of the sound insulation cover, a liquid inlet pipe is arranged on the sound insulation cover, an annular containing cavity is formed in the bottom of the sound insulation cover, and the bottom of the sound insulation cover is installed in the base in a limited sliding mode. And when the liquid in the annular containing cavity flows into the base, the pressure of the liquid drives the whole sound insulation cover