The invention discloses an industrial robot for automatically feeding and discharging materials. The robot structurally comprises a shaft arm, an upper support arm, a lower support arm, an oil pump, amoving base, a horizontal movable beam and a support, wherein movable fitting is adopted between the upper support arm and the lower support arm, the upper support arm is fixed at the bottom end of the horizontal movable beam through the shaft arm, the horizontal movable beam is provided with the oil pump and the moving base, and the oil pump communicates with the upper support arm and the lowersupport arm. According to the robot, a spilling port and a circulation loop are integrated together on a rotating shaft, when the oil spilling condition occurs in oil holes surrounding the outer surface of an axis of a rotating shaft, the circulation loop internally generates negative pressure under action of a suction pump to discharge the spilled oil liquid through the spilling port, under the action of an oil outlet hole, the oil liquid forms a cycle and is discharged into an oil channel again, when the oil liquid is squeezed out of the outer surface of the rotating shaft, the oil liquid issucked thereinto again through the spilling port, so that while the oil liquid is prevented from being squeezed out of the rotating shaft (namely a joint), the waste of lubricating oil is reduced.