Reciprocating pump

The invention discloses a reciprocating pump, and relates to the technical field of pumps, the reciprocating pump comprises a pump body, a mounting cavity and a pump cavity are arranged in the pump body, a sliding cavity is arranged between the mounting cavity and the pump cavity, the mounting cavity and the pump cavity are communicated through the sliding cavity, oil liquid is stored in the mounting cavity, a crankshaft is rotatably connected in the mounting cavity, and a piston slides in the sliding cavity; the pump body is further provided with a flow guide cavity, the flow guide cavity is located at the end, in the axial direction of a rotating shaft of the crankshaft, of the installation cavity and communicates with the installation cavity, the pump body is further provided with a flow guide pipe, and the flow guide pipe is made of heat conduction materials. The flow guide pipe is located on the outer side of the pump body and communicates with the installation cavity and the flow guide cavity, and the r