Grinding unit of machining member inner hole end surface

The utility model relates to a machining technique of a spiral case, in particular to a grinding device of an end face of an inner hole of a machining workpiece. The grinding device adopts the technical proposal that: a clamp lever is arranged at the lower end of an output shaft of a power source, a grinding head which is made of material same as or similar to a workpiece to be machined is arranged below the clamp lever, a lower end face of the grinding head is a grinding face, and a positioning column is arranged at the lower end of the grinding head. When the grinding device is used, the grinding head is arranged on a bench drill, the grinding head is used to rework the surface to be reworked of the workpiece so that the reworked surface can achieve the required size and roughness.