TECHNOLOGY FOCUS - ENVIRONMENT - Preferred Method: The method comprises (i) preparation of raw materials by (a) transporting urban domestic waste materials into a large sealed waste material preparation warehouse, spraying lime powder to all the waste in the warehouse according to season, weather and the fermentation of the waste, and spraying alkaline solution to oxidize and sterilize waste, (b) transferring the waste materials to a double-blade spiral conveyer with blade having sharp edge, transferring the deodorized and sterilized urban household waste to further process, (ii) performing waste screening, gravity separation, sieving and crushing using a screening separator for waste to separate the bag, where the device in the municipal solid waste and blade of double helix conveyor release large part of waste, removing waste outer plastic plank for packing bag and aniseed block waste, screening the separating roller provided with a frame, where the frame is provided with the outer circumferential surface which is not less than the screen, the frame inner circumferential wall is provided with a dismounting broken bag and big block of waste as the stretching finger and the tip of the claw form the sharp edge composed of main part comprising screening separating machine provided with the waste and removable waste, screening waste through the mesh of sieve waste into production line under the belt conveyor upper surface to enter into the next step for screening and releasing large block waste for detaching plastic bag and the scattering waste block provided with screening and crushing effect, gravity separating the waste screening by selecting primarily screening detachable waste to sieve the gravity sorting machine, where the upper part of the gravity separation hopper enter into centrifugal cylinder surface according to the waste granules or blocks of different gravity characteristics to carry out separation, conveying small waste into lower part of the rubber belt conveyor conveyed to the next process, gravity separating the heavy metal, glass, stone, brick, and cement block based on the mass, conveying production line by gravity separating the waste, and setting the belt conveyor at the upper part of a metal separator for magnetic separation, or waste separating to the metal iron by gravity separation, cylinder sieve separating and gravity separating waste adopts universal standard screen to screen cylinder, cylinder sieve, the separated plastic, paper of the light material chosen from air, and sieving and winnowing the waste into new fuel as qualified raw material f-type rotary crusher to crush through screening and gravity separation, sieve separating the separated sieve adopts double-rotating crusher to crush, crushing to 3-10 of standard, double-rotating crusher comprising a machine body and a base, roller and transmission device composed of machine cylinder of mill roller shaft, roller body is fixed on the roller on the several-cutter, where the inner circumferential surface of the roller according to the step are provided with multiple groups of crushing waste by the catling component, crushing the double-rotating crusher into particle state by the belt conveyor to crush waste to next process, (iii) drying, removing water, and sending the qualified waste material using a universal roller shape drier, where the feeding port and the discharging port process temperature of the drying machine is 500-80 degrees C, and the material humidity decreases from 60-30%, and (iv) compressing and forming, warehousing the finished product, drying, and removing the water of the waste raw materials, shaping by a roller extruding type molding machine into rectangle shape, column shape, and different geometrical shapes of fuel block product to obtain bulk granular fuel product which is finally warehoused.