NOVELTY - Biomass molding fuel preparation system comprises raw material pretreatment system, low temperature pyrolysis system, high-temperature gasification system, compact molding system and boiler system. The raw material pretreatment system includes a biomass processing system and a sludge treatment system. The biomass processing system comprises biomass drying chamber (1) and biomass pulverizer (2). The sludge processing system comprises sequentially connected sludge drying chamber (3), dried sludge grinding machine (4) and sludge material warehouse (5).    USE - Used as biomass briquette preparation system (claimed).    ADVANTAGE - The preparation system: integrates biomass gasification and biomass molding technologies; has high gasification quality and high efficiency, low operating and maintenance cost; produces the molding fuel having good performance by subjecting biomass to two-stage gasification; utilizes the gasification residue; can achieve the stabilization of sludge reduction; is harmless; and utilizes resource to the maximum extent.    DETAILED DESCRIPTION - Biomass molding fuel preparation system comprises raw material pretreatment system, low temperature pyrolysis system, high-temperature gasification system, compact molding system and boiler system. The raw material pretreatment system includes a biomass processing system and a sludge treatment system. The biomass processing system comprises biomass drying chamber (1) and biomass pulverizer (2). The sludge processing system comprises sequentially connected sludge drying chamber (3), dried sludge grinding machine (4) and sludge material warehouse (5). The biomass drying chamber and the sludge drying chambers are connected. The low temperature pyrolysis system includes a low-temperature pyrolysis furnace, a first gas purifier and a pyrolysis gas pipe. The gas purifier is installed in pyrolysis gas pipe. The low temperature pyrolysis furnace and biomass pulverizer are connected. The low temperature pyrolysis furnace produces a low temperature pyrolysis coke through a screw conveyor which is supplied to the high-temperature gasification system. Low temperature heat is generated by Pyrolysis gas vent pipe which is delivered to the high-temperature gasification system. The high-temperature gasification system comprises a high temperature gasification furnace, secondary cyclone separator, a heat exchanger, waste heat boiler, second gas purifier, residue chamber and gas storage tank connected sequentially. The low-temperature pyrolysis coke and low temperature pyrolysis gas produced are delivered to the high-temperature gasification system through screw conveyor and gas vent pipe respectively. The heat exchanger is connected with the high temperature gasification system through a pipeline. The high-temperature gasification system, the first gas purifier, the second gas purifier and the secondary cyclone separator are connected with the residue chamber. The compact molding system comprises sequentially connected an auxiliary raw materials storage, a mixer, a forming machine and a cooling tower. The auxiliary raw materials storage and the residue chamber is connected to the mixer. The boiler system comprises a biomass boiler, also includes high temperature steam pipes. The high temperature steam pipe and the biomass boiler is connected at one end and the biomass drying chamber and/or sludge drying chamber is connected at the other end. The boiler system further comprises a smoke delivering duct. The smoke delivering duct is provided with a high-temperature dust collector. The smoke delivering duct and the biomass boiler is connected at one end and at the other end is connected with the low-temperature pyrolysis furnace. An INDEPENDENT CLAIM is also included for preparation of biomass molding fuel in the preparation system, comprising (i) drying: high-temperature steam drying of biomass and sludge at 160-200 degrees C to obtain biomass moisture content of less than or equal to 20% and sludge moisture content of less than or equal to 45%, (ii) grinding: pulverizing the dried biomass using to obtain particle size less than or equal to 10 mm, drying until moisture content is 25-35%, and crushing to obtain particle size less than or equal to 3 mm, (iii) pyrolysis: transferring the biomass obtained in step (ii) to a low-temperature pyrolysis furnace, extracting at high temperature of 220-300 degrees C from biomass boiler, generating smoke by low-temperature pyrolysis of biomass, carrying out low temperature pyrolysis at 200-280 degrees C for 10-40 minutes to obtain low temperature pyrolysis gas and low temperature pyrolysis coke, (iv) gasification: cooling the low temperature pyrolysis gas and low temperature pyrolysis coke, delivering to a high temperature gasification system, generating steam in biomass boiler through high temperature gasification system, maintaining the high- gasification temperature at 750-900 degrees C, where the gasification medium is steam or air vapor, if the gasification medium is steam then the mass ratio of the steam and biomass is 0.7:2.1, if the gasification medium is air water vapor equivalence ratio of air is 0.22- 0.28, and mass ratio of the steam and biomass 1.2:1.8, carrying out high-temperature gasification through heat exchangers, utilizing waste heat, purifying, storing gas in gas storage tank or converted into liquid fuel, after high temperature gasification crushing the residue, and storing in the residue chamber, and (v) forming: pulverizing and mixing dried sludge, auxiliary materials, residues and deodorant desulfurizer, and transferring in molding machine to obtain biomass briquette.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the biomass molding fuel preparation system.    Biomass drying chamber (1)    Biomass pulverizer (2)    Sludge drying chamber (3)    Dried sludge grinding machine (4)    Sludge material warehouse (5)