NOVELTY - The sludge synthetic fuel is claimed, which is prepared by transmitting sludge with 80% of water in a material storage cabin (1) into a stirrer (3) to stir with a first auxiliary material equably transmitted by a material adding device, transmitting the sludge into a steel belt pressure filter (4) automatically to sequence and dewater forcefully till sludge cake with less than 50% of water, cutting the sludge via a cutter (5), and transmitting the sludge into a sludge hot air drier (6) automatically to dry till dispersed material with 30% of water.    USE - Used as a sludge synthetic fuel.    ADVANTAGE - The sludge synthetic fuel can be simply and economically prepared with less energy consumption in an environmentally friendly manner.    DETAILED DESCRIPTION - The sludge synthetic fuel is claimed, which is prepared by transmitting sludge with 80% of water in a material storage cabin (1) into a stirrer (3) to stir with a first auxiliary material equably transmitted by a material adding device, transmitting the sludge into a steel belt pressure filter (4) automatically to sequence and dewater forcefully till sludge cake with less than 50% of water, cutting the sludge via a cutter (5), transmitting the sludge into a sludge hot air drier (6) automatically to dry till dispersed material with 30% of water, transmitting the sludge to a material mixer automatically to equably mix with a second auxiliary material transmitted by a material adding device as a certain ratio, transmitting the sludge to a honeycomb briquette forming machine to prepare honeycomb-shaped coal, transmitting the sludge to a flat conveyor, and transmitting the sludge to a material storage field to pile. The devices are: arranged as the processes; connected with each other; mounted; and controlled by an electric automatic metering control cabinet, where connection parts are sealed by connection baffles. The conveyor is a screw pump and a conveying belt. The first auxiliary material is prepared by mixing lime, straw slag or bits of wood and bactericidal agent in a certain ratio. The second auxiliary material is prepared by mixing illegal cooking oil, preservative and standard raw coal at a certain ratio. An air outlet of the sludge hot dryer is provided with a heat-exchanging energy-saving device and a smoke-removing and dust-removing device. The hot air source is generated by sludge fuel, uses the boiler tailing gas around the production field.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a sludge synthetic fuel.    Material storage cabin (1)    Stirrer (3)    Steel belt pressure filter (4)    Cutter (5)    Sludge hot air drier. (6)