Industrial robot mechanical arm with high motion accuracy

The utility model discloses an industrial robot mechanical arm with high motion accuracy, a lubricating mechanism comprises an oil sleeve and an oil pipe, the oil sleeve is sleeved on the outer surface of a mechanical arm connecting shaft, the outer surface of the oil pipe is fixedly connected with the outer surface of the mechanical arm through a fixing ring, and the utility model relates to the technical field of mechanical arms. According to the industrial robot mechanical arm with the high motion accuracy, by arranging the lubricating mechanism, firstly, an oil sleeve is arranged outside a connecting shaft in a sleeving mode, so that certain abrasion is avoided, and a piston slides in an oil pipe to extrude lubricating oil in the oil pipe, so that the lubricating oil is discharged through an oil outlet pipe and enters the oil sleeve; and when the piston resets, the lubricating oil moves reversely so as to lubricate the surface of the connecting shaft again, and through the combination of the structures, t