Combined tool for machining feeding rocker arm and discharging rocker arm of high-speed diesel engine and machining method of combined tool

A combined tool for machining a feeding rocker arm and a discharging rocker arm of a high-speed diesel engine comprises a base, a connecting base, a supporting base, a pressing plate and connecting bolts of all gears. The base is a base of the whole tool and is connected through bolts and positioned and installed on a machine tool table top through positioning pins, the upper portion of the base is provided with an inclined potential consistent with the included angle between the axis of a part and the two end faces, and it is guaranteed that the axis of the part is parallel to the table top after installation. The connecting base is used for connecting the base and the supporting base, it is guaranteed that parts have proper heights after being installed, interference is avoided, the parts are fixed through the connecting bolts, and due to the fact that the connecting base is actually used for connection, the upper plane and the lower plane both need to have high planeness requirements, and the parallelism r