The utility model provides an auxiliary device is strideed across to pipeline visual detector appearance inspection shaft. An auxiliary device is strideed across to pipeline visual detector appearance inspection shaft, includes the organism, the camera system above setting up the wheel of organism both sides and setting up the organism, it is still including setting up at flexible arm, and flexible arm setting both ends around the organism, and flexible arm is located the wheel top, and the non - connect to engine body one end of arm of stretching out and drawing back is provided with the hydraulic leg. Flexible arm includes work arm component, drive unit, loose pulley assembly and wire rope subassembly, and the work arm component includes basic arm, II sections arms, III sections arms, IV sections arms and V sections arms, and drive unit includes I# telescoping cylinder, II # telescoping cylinders, and loose pulley assembly is including combination rope pulley, telescopic rope pulley, I# arm rope pulley and the II # arm rope pulley that contracts that contracts, and the wire rope subassembly is including combination wire rope, telescopic rope, I# arm rope and the II # arm rope that contracts that contracts.