The design of the outer wall of the pipeline inspection robot, applied to the external survey and inspection of the pipeline, adapted to the bare working conditions of the pipeline maintenance and repair, the main body of the use of large power motor, load capacity enough robot assembly of various types of testing equipment, because its work in the pipeline outside, allowing the pipeline in the process of continuous supply of inspection work. The rear-mounted clamping device, combined with the characteristics of its external movement through the flange, allows the robot to cross the flange automatically, without the need to interrupt the work.