Valve spring assembling clamp and method

The valve spring assembling clamp comprises a base, a positioning seat and a guide mechanism, a groove is formed in the base, the first end of the positioning seat is located in the groove, the bottom of the positioning seat and the side face and the bottom face of the groove define a sealed cavity for storing hydraulic oil, and an oil supply hole communicated with the cavity is formed in the base; a first plugging body is arranged in the oil supply hole, a positioning unit used for positioning a valve plug is arranged at the second end of the positioning seat, the guide mechanism is in interference fit with the end of the second end of the positioning seat, a spring mounting head used for positioning a spring is arranged in the guide mechanism, and one end of the spring mounting head is of a conical structure. The conical angle of the conical structure is consistent with the spiral taper of the spring, an elastic assembly is arranged at the other end of the conical structure, and the central axis of the spri