The present invention belongs to the pipeline system field and discloses a pipe passing device. The pipe passing device comprises a main body; and a groove extending along the length of the main bodyis formed in the surface of the main body. The groove is formed in the surface of the main body of the pipe passing device, and therefore, wire rods such as optical fibers, electric wires and steel wires can be hung conveniently, different task requirements can be met, the functions of the pipe passing device can be increased, and the role of the pipe passing device can be given to full play. Forexample, an optical fiber can be arranged in the groove of the pipe passing device; a device such as an optical fiber detector can be loaded at the head of the pipe passing device, and therefore, thepipe passing device can detect the inner condition of an underground pipeline when passing through the underground pipeline.