The high-pressure oil pump is a double plunger parallel oil pump. When the pressure is low, the concave convex plunger also supplies oil. When the pressure exceeds the set pressure, the low-pressure oil overflows actively. When the pressure is not high, the plunger pressurizes. There are two kinds of oil circuits: single oil circuit and double oil circuit. The high pressure oil pump has compact structure, convenient operation, high pressure and small flow. It can be equipped with low pressure pump to improve the efficiency of the task. On the basis of crude oil pipeline, hydraulic components such as electromagnetic directional valve, pressure relay and hydraulic lock can be added to control the system. It can directly carry out pressure experiments on pressure vessels, and equip oil cylinders and machines for lifting, jacking, bending, straightening, stretching, punching, riveting, disassembly and assembly.