A uniform polishing device for the surface of a stainless steel pipe comprises a polishing box; a plurality of fixing rings of which the centers are aligned are linearly distributed in the polishing box, the opposite side faces of the annular walls of every two adjacent fixing rings are connected with a polishing cotton wheel, and rotary shafts of the polishing cotton wheels are connected with driving motors; and the two ends of the polishing box are provided with fixtures for fixing the steel pipe. According to the uniform polishing device, the polishing cotton wheels on the fixing rings arranged in the polishing box cooperate with the fixtures in the polishing box, and thus, the surface of the stainless steel pipe is polished so that environment disturbance can be reduced.