NOVELTY - Organic waste is sent through a solid-liquid separator, which enables liquid and solid waste to enter to liquid automatic force modular anaerobic fermentation device (A1) and solid automatic force modular anaerobic fermentation device (B1), respectively. Biomass fuel gas (A) is generated in device (A1), finely filtered with zeolite, and gas is sterilized. Generated gas (A) is passed to device (B1), in which biomass fuel gas (B) is generated. Generated gas (B) is mixed with gas (A), desulfurized and carbon dioxide is removed, and resultant gas is stored and conveyed.    USE - Method for cleaning and processing organic waste, and supplying clean energy source in rural area.    ADVANTAGE - The method improves comprehensive utilization rate of rural organic waste, reduces environmental pollution, and improves economical benefit for farmers.    DETAILED DESCRIPTION - Organic waste of each home in village is collected and sent to organic waste cleaning and processing center, periodically, through solid-liquid separator, which enables liquid and solid waste to enter into liquid automatic force modular anaerobic fermentation device (A1), and solid automatic force modular anaerobic fermentation device (B1), respectively, for anaerobic fermentation. Liquid and biomass fuel gas (A) are generated in device (A1), exposed, finely filtered with zeolite, and gas is sterilized. Liquid is exhausted to farmland. The generated biomass fuel gas (A) is passed to device (B1), exposed, finely filtered with zeolite, and gas is sterilized. Liquid is exhausted to farmland. The generated biomass fuel gas (A) is passed to solid automatic force modular anaerobic fermentation device, in which biomass fuel gas (B) and the solid organic material are generated. Generated biomass fuel gas (B) is mixed with biomass fuel gas (A), desulfurized and resultant carbon dioxide is removed, low-pressure compression is carried out, and resultant gas is stored and conveyed to each home in the village through the pipeline for each user to use. The generated solid organic material is subjected to anaerobic fermentation and dewatered compression, and processed, to obtain biomass fuel or directly processed into organic fertilizer or edible mushroom.