The invention belongs to the field of relevant equipment for sludge treatment, and discloses a cloth bag type electrolytic dewatering tool. The cloth bag type electrolytic dewatering tool comprises a net rack, a dewatering filter bag, a conductive metal net, an annular fixing piece and multiple anode metal bars, wherein the whole net rack is of a form in which an inner layer cylinder and an outer layer cylinder are arranged coaxially in a sleeving manner and is used as a mounting foundation for other components; the dewatering filter bag is mounted on the outer side of the outer layer cylinder of the net rack in a close fitting manner along the axial direction; the conductive metal net is mounted on the inner and outer layer cylinders of the net rack respectively; the annular fixing piece is used for fixing and connecting the multiple anode metal bars and realizing electric connection between the anode metal bars and the conductive metal net. Compared with existing equipment, the cloth bag type electrolytic dewatering tool disclosed by the invention has the advantage of obviously improving the convenience and the efficiency of sludge dewatering operation; furthermore, the cloth bag type electrolytic dewatering tool has the advantages that the structure layout is compact and reasonable, the operation and maintenance cost is low, no potential hazard of secondary pollution is caused, the influence of territory is small, and giant mechanical transportation and other matching devices are not needed.