The invention discloses a plunger pump. The plunger pump comprises an oil cavity for accommodating hydraulic oil and a pump cavity for accommodating media, wherein the oil cavity and the pump cavity are arranged in an isolated manner. The plunger pump has the advantages that the plunger pump is provided with the oil cavity and the pump cavity which are arranged in the isolated manner, the oil cavity is used for accommodating the hydraulic oil, the pump cavity is used for accommodating the to-be-conveyed media, the to-be-conveyed media cannot enter the oil cavity, the oil cavity can be prevented from being abraded by the media, oil cavity abrasion is reduced, and the energy consumption of the whole plunger pump is lowered effectively.