Outer polishing machine for steel pipe surface treatment

The utility model relates to the technical field of steel pipe surface treatment, and particularly discloses a steel pipe surface treatment outer polishing machine which comprises a supporting mechanism, the supporting mechanism is composed of an inner supporting assembly and an outer supporting assembly arranged on the outer side of the inner supporting assembly, and the upper end of the inner supporting assembly is matched with a lower riding wheel frame assembly in a sliding mode. An upper pressing wheel frame assembly is fixedly installed at the upper end of the outer supporting assembly, and a side polishing wheel frame assembly is fixedly installed at the upper end of the lower supporting wheel frame assembly and located on the side face of the outer supporting assembly. In the utility model, the driving motor I is driven to control the gear I and the rack I to be in meshing transmission, so that the riding wheel frame base moves along the chute II in a guiding manner, the supporting angle and the suppo