NOVELTY - A drum-type sludge turning machine used in aerobic fermentation of solid waste comprises a rack, a rotary drum mechanism, a traveling mechanism, a lifting mechanism, a cable retracting mechanism, a dependent wheel mechanism, a mudguard mechanism, and an automatic control system. The rack comprises front part and back part which is integrally rectangular, and inner parts provided with locating key panels. The rotary drum mechanism comprises a rotary drum and a turning cutter, and is driven to rotate by an electric motor.    USE - Drum-type sludge turning machine used in aerobic fermentation of solid waste (claimed).    DETAILED DESCRIPTION - A drum-type sludge turning machine comprises a rack, a rotary drum mechanism, a traveling mechanism, a lifting mechanism, a cable retracting mechanism, a dependent wheel mechanism, a mudguard mechanism, and an automatic control system. The rack comprises front part and back part which is integrally rectangular, and inner parts provided with locating key panels. The front and back parts are connected with bolts. The rotary drum mechanism comprises a rotary drum and a turning cutter, and is driven to rotate by an electric motor. The cutter on the rotary drum is connected with the rotary drum by bolts. The traveling mechanism comprises an electric motor, a traveling wheel and a solid rubber tire. The lifting mechanism is in a pointed shape, and has upper end connected with the rack by bolts, and lower end connected with the rotary drum by bolts. The cable retracting mechanism is fixed on the rack back part by bolts. The dependent wheel mechanism is arranged on outer side of the rack and can contact with the surface of a rail. The mudguard mechanism comprises mudguards at front end, on side surface, bottom part and back part. The mudguards are connected with the rack by bolts. An automatic control cabinet is placed on tail part of the sludge turning machine, which is connected with a rear rack by bolts. An INDEPENDENT CLAIM is included for a sludge turning method comprising driving the cutter to rotate at high speed by the rotary drum for stirring and crushing the material, then throwing the material to rear part of the turning machine. The material is a uniform mixture with average density of 0.6-0.8 tons/m3 and moisture content of not greater than 65%.