Barrel processing tool

The invention provides a barrel processing tool. The barrel processing tool comprises a base which is connected with a workbench, wherein a lower supporting base is arranged on the base; an upper supporting base is mounted on the lower supporting base; a circular workpiece mounting space is enclosed between the upper supporting base and the lower supporting base; two supporting assemblies are symmetrically arranged on the lower supporting base; a supporting assembly is arranged on the upper supporting base; the end part of each supporting assembly is provided with a roller wheel; roller wheels of the three supporting assemblies are positioned in the circular workpiece mounting space; and when a workpiece is filled in the circular workpiece mounting space, the supporting assemblies are supported on the external contour surface of the workpiece. The barrel processing tool is convenient for clamping barrel parts, and can be suitable for workpieces with different dimensions by virtue of regulation of screws in the supporting assemblies; a stop structure and a supporting table are used for conveniently supporting the upper supporting base after a clamp is opened, so that stability of the clamp is guaranteed.