The utility model discloses a conveyor for sludge treatment. The device comprises a machine body, sound-absorbing strips and a rotating shaft, a feeding hopper is fixed to one side of the top end of the machine body. A discharging pipe is fixed to one side of the bottom end of the machine body. a stranding cage is fixed in the machine body; a supporting frame is fixed to one end of the machine body. a speed reducer is fixed on one side of the machine body; impurities in the sludge can be effectively filtered through the mesh screen; blocking of the stranding cage due to large size of the sundries is avoided; normal use of the stranding cage is ensured; the wear resistance of the spiral blade of the stranding cage can be improved through the hard alloy; the abrasion degree of the spiral blades is reduced, the service life of the spiral blades is prolonged, the maintenance cost of the stranding cage is reduced, normal use of the conveyor is guaranteed, noise generated in the use processof the conveyor can be effectively blocked and absorbed through the sound absorption strips installed on the inner side wall of the conveyor body, noise pollution of the conveyor body is reduced, theenvironment is protected, and the spiral conveyor is economical and practical.