The invention discloses a cable conduit dredging device and relates to the technical filed of electric power construction tools. The cable conduit dredging device is used for solving the problem that a cable conduit is difficult to dredge. The cable conduit dredging device comprises a front advancing device, a dredging device, a compression spring, a rear advancing device, a rope winder, a pull rope set, an air pump, a water pump and a controller. The front end of the compression spring is connected on the front advancing device, and the rear end of the compression spring is connected on the rear advancing device. The front advancing device and the rear advancing device comprise air bags correspondingly. The rope winder is connected on the rear advancing device. The rope winder comprises rope winding wheels. The pull rope set comprises pull ropes. The front ends of the pull ropes are connected on the front advancing device, and the rear ends of the pull ropes are wound on the winding wheels. The dredging device comprises a nozzle connected with the water pump. The water pump, the air pump and the driving motor are electrically connected with the controller. The cable conduit dredging device has the beneficial effects that the device can move in the cable conduit smoothly, and dredging of the cable conduit is facilitated.