Plunger pump with high precision and high sealing performance

The utility model relates to a plunger pump with high precision and high sealing performance, which comprises a pump head and a plunger rod, a liquid storage cavity is arranged in the pump head, the plunger rod reciprocates up and down in the liquid storage cavity, a sealing element is annularly arranged at the bottom of the liquid storage cavity, the sealing element comprises a sealing compression ring and a sealing ring, the sealing compression ring and the sealing ring are both embedded in the inner wall of the liquid storage cavity, and the plunger rod is arranged in the liquid storage cavity. The sealing compression ring comprises a bottom ring and an upper ring body, the upper ring body is an inclined conical ring body and is in interference fit with the plunger rod, the sealing ring is arranged above the bottom ring, an annular flow guide groove is formed in the inner wall of the liquid storage cavity, and the flow guide groove is adjacent to the sealing piece. Compared with the prior art, the utility