The invention discloses equipment for cleaning stains of a rectangular steel pipe for transporting oil. The equipment comprises a box body; the top of the box body is provided with a through hole, a first driving mechanism and a third driving mechanism; a first clamping block is arranged on a first output shaft of the first driving mechanism; a third output shaft of the third driving mechanism comprises a second clamping block; a second driving mechanism is arranged at the bottom of the box body; a second output shaft is arranged on the second driving mechanism; a plurality of blades are arranged on the second output shaft; a heating wire and a filtering net are further arranged inside the box body; the heating wire is used for removing paraffin on the surface of an oil drill pipe; the filtering net is used for filtering sewage sludge; and a water inlet, a sewage outlet and a water outlet are formed in the outer wall of the box body. The equipment for cleaning the stains of the rectangular steel pipe for transporting the oil is simple in structure and convenient to use, rectangular oil pipelines can be effectively cleaned, a large amount of labor is saved, moreover, the multiple rectangular oil pipelines can be cleaned simultaneously, and the cleaning efficiency is improved.