Bridge detection crawler

The utility model relates to the field of bridge detection devices, in particular to a bridge detection crawler which comprises a climbing unit for providing upward climbing force for the whole device and a camera unit, wherein the camera unit is fixed to the climbing unit and is used for obtaining bridge bottom face information. A support rod is arranged above the climbing unit, and the upturned suspending end of the support rod is provided with a universal wheel. When filming is conducted, the distance between a camera and the bridge bottom face can be determined under the action of the support rod and the universal wheel, and filming sharpness is guaranteed; meanwhile, the bridge detection crawler is simple in structure, free of involving complex circuits and very low in cost.