A rust removal device for the outer wall of a construction pipeline, comprising a base, on which a moving groove with an opening facing upwards is provided, a moving block is arranged in the moving groove, and a horizontal thread through hole is arranged on the moving block, and the horizontal thread The threaded rod is connected to the internal thread of the through hole, and the two ends of the threaded rod are erected on the base on both sides of the moving groove, and the right end of the threaded rod is fixedly connected with the first motor output shaft fixedly arranged on the right side wall of the base; The side is fixedly connected with a first support frame, the top of the first support frame is fixedly connected with a baffle plate, a circular groove is opened on the left side wall of the baffle plate, and the right end of the pipe is against the inner side of the circular groove. Compared with the prior art, the beneficial effect of the present invention is that when the pipeline is moving, the outer wall of the pipeline is derusted by a rotating wire brush, thereby improving the maintenance efficiency of the pipeline. The invention has the advantages of reasonable structural design, convenient use, high derusting efficiency, etc., and has certain popularization and application value.