Welding finishing device

A welding finishing device, comprising a base (1), wherein supporting rods (2) are fixedly mounted on a left side and a right side of an outer surface of an upper end of the base (1), a top plate (3) is fixedly mounted on outer surfaces of upper ends of the supporting rods (2), a finishing assembly (4) is fixedly mounted in a middle of an outer surface of a lower end of the top plate (3), a workpiece (6) is provided in a middle of the outer surface of the upper end of the base (1), a welding seam protruding part (5) is provided in a middle of the workpiece (6), positioning assemblies (7) are fixedly mounted on the left side and the right side of the outer surface of the upper end of the base (1), the finishing assembly (4) comprises a second sliding chute (24), a second sliding block (25), a double-shaft air cylinder (26), a mounting block (27), a second mounting plate (28), a first air cylinder (29), a motor (30), a polishing disc (31), a rotating shaft (32), a cutter (33), a mounting disc (34), a second air cylinder (35) and a movable block (36), the second sliding chute (24) is formed in the outer surface of the lower end of the top plate (1), the mounting block (27) is fixedly mounted on a right side of an outer surface of a lower end of the base (1), the double-shaft air cylinder (26) is fixedly mounted on an outer surface of the left side of the mounting block (27), and the second sliding block (25) is fixedly mounted on an outer surface of an upper end of the movable block (36).