The utility model belongs to the technical field of pipeline cable laying. A problem that a cable is easy to bend is solved. Traction trolley easy to slip, pipeline robot is high in manufacturing cost, narrow pipeline operation is inconvenient; the flexible stretching cannot be realized, and the like, the utility model provides a cable duct tractor. The walking device comprises a machine frame andwalking mechanisms fixed to the machine frame, each walking mechanism comprises a walking wheel support and a walking wheel connected with one end of the walking wheel support through a shaft, the machine frame is composed of a single rigid rod piece, the other end of each walking wheel support is hinged to the single rigid rod piece machine frame, and at least two walking mechanisms are installed on the single rigid rod piece machine frame. According to the utility model, the rack in a bent structure form is formed by the single rigid rod piece, so that the mounting space of the traveling wheel is greatly increased, the size of the tractor can be made very small, and the tractor does not occupy space; the cable laying efficiency can be effectively improved, and the problem that manual cable penetrating or external automatic cable penetrating curls is solved.