The invention relates to the technical field of a car full moving shaft, and discloses a car full-moving-shaft automatic positioning flexible grinding process. The process comprises the following steps that a mechanical arm, a numerical control milling machine, a numerical control grinding machine, a dedicated chamfering and drilling machine, a blanking line, a discharging line, and a shaft sleevepositioning mechanism are arranged in the work area, according to the layout manner, the mechanical arm serves as the center, and the numerical control milling machine is arranged on the back face ofthe mechanical arm. According to the car full-moving-shaft automatic positioning flexible grinding process, the mechanical arm automatically transports the materials among three machining devices atthe rotating hole machining station, the hole chamfering station and the grinding machining station, the machining time when the material leaves the blanking line and is put into the discharging lineis about 120 seconds, the action is not repeated, in each hour, 82 materials can be machined, the material machining whole process is automatic, manual operation is not needed, the automation degree is high, a large amount of manpower is saved, production cost is reduced, production speed is high, and efficiency is high.