The invention discloses a pipeline sludge discharging device which comprises a traction system and a collecting system. The traction system comprises a sliding ring. The sliding ring is connected to apipe shaft in a sliding manner. Multiple lifting ring screws are arranged on the end face of the sliding ring in the circumferential direction of the sliding ring. Lifting rings of the lifting ring screws are connected with steel ropes. The steel ropes penetrate pulleys to be fixed to corresponding lifting rings on a traction disc. The traction disc is foxed to a steel wire soft pipe. The collecting system comprises multiple guide rails. The guide rails are fixed in the circumferential direction of the tail end of the pipe shaft. Sliding block seats are installed on the guide rails, and supporting frameworks are connected to the sliding block seats. The other ends of the supporting frameworks are connected with the sliding ring, and a steel wire filtering net is connected to the peripheries of the supporting frameworks. The pipeline sludge discharging device is particularly suitable for the condition that the depth section of a pipeline is completely blocked, after dredging is completed, water is filtered out from cut chippings through the unfolded umbrella-shaped steel wire filtering net, the chippings are dragged out of the draining pipeline, people are prevented from descendinga well for cleaning, and the dredging and sludge discharging safety and work efficiency are improved.