Rail-mounted tunnel inspection robot

The utility model belongs to the field of tunnel defect detection, and relates to a track type tunnel inspection robot. The system comprises a track, a walking module moving along the track, a pressing module used for pressing the walking module on the track, an energy supply module used for supplying energy to the walking module, a camera shooting module arranged on the walking module, and a communication module used for transmitting data of the camera shooting module. The walking module comprises walking wheels. According to the utility model, the position of the walking module is calibratedthrough the positioning module, and the walking module is calibrated once every other distance, so that the accumulative error of the position positioning of the walking module is reduced; long-distance remote power supply of the walking module is realized through the sliding contact line; the degree of freedom of the walking wheels in multiple directions is limited through the pressing modules,so that the walking wheels