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The present application relates to a kind of mixed components, sludge coal-water slurry preparation system and its preparation method, which can be low-cost and efficient consumption processing of residual sludge after sewage treatment.Sludge coal-water slurry preparation system includes slurry mixing machine for mixing the coal powder and sludge slurry, slurry mixing machine is divided into coal processing device and sludge processing device 2 paths before setting respectively;Coal processing device includes crusher for crushing raw coal, vibrating screen in order according to its processing process, return device is arranged between crusher, vibrating screen for raw coal that has not passed through screen mesh hole is transported back to crusher;Sludge processing device includes slurry pulverizer for crushing sludge into sludge slurry;Produced coal-water slurry is more suitable for fluidized bed boiler combustion;Slurry preparation system before furnace can also save transportation and storage cost and its influence on surrounding environment.