NOVELTY - The method comprises: sorting and classifying domestic garbage; crushing and screening; carrying out biochemical treatment processes for the separated organic matter, where the biochemical treatment processes comprises aging degradation, acidification degradation and anaerobic fermentation. The aging degradation step comprises conveying the organic matter into a reaction vessel through a conveying pump, sieving and curing. The acidification degradation step comprises curing of the organic matter entering into an aerobic acidification tank at high temperature.    USE - The method is useful for processing domestic garbage to produce cooking fuel and farmland fertilizer (all claimed).    ADVANTAGE - The method is capable of processing domestic garbage in an environmental-friendly and energy-saving manner.    DETAILED DESCRIPTION - The method comprises: sorting and classifying domestic garbage; crushing and screening; carrying out biochemical treatment processes for the separated organic matter, where the biochemical treatment processes comprises aging degradation, acidification degradation and anaerobic fermentation. The aging degradation step comprises conveying the organic matter into a reaction vessel through a conveying pump, sieving and curing. The acidification degradation step comprises curing of the organic matter entering into an aerobic acidification tank at high temperature. The anaerobic fermentation step comprises degradation of the stabilized organic matter entering into an anaerobic fermentation through a pipeline automatically, passing the degraded matter into a closed fermenter for anaerobic fermentation, passing the fermented organic matter into a biogas fermentation tank comprising water, hydrogen sulfide and carbon dioxide, isolating the fermented liquid precipitate by a solid-liquid separator, and separating solid organic fertilizer and liquid organic fertilizer. The sorting and classification step comprises separating inorganic waste, recyclable waste and hazardous waste, crushing the waste, screening, separating coarse particles using a screening machine, passing the mixed waste through a pulverizer, allowing the waste to enter into a flotation tank, and adding liquid deodorant into the tank. The biochemical treatment processes is carried out at 53-65 degrees C. The acid degradation is carried out at 36-40 degrees C for 46-50 hours. The anaerobic fermentation is carried out for 22 days. An INDEPENDENT CLAIM is included for a device for processing domestic garbage.