NOVELTY - Decomposing and treating municipal solid waste, comprises selecting a rough garbage, sorting rough garbage, selecting organic matters, sorting organic matters, selecting inorganic matters, sorting roughed inorganic matters, cleaning and sterilizing inferior organic matters, cleaning and sterilizing the superior organic matters, grinding fermented superior organic matters, packing the feed, selecting and sorting nonmagnetic materials, cleaning and sterilizing cleaned magnetic materials, cleaning and drying sterilized magnetic materials, and packaging dried magnetic materials.    USE - The method is useful for decomposing and treating municipal solid waste (claimed).    ADVANTAGE - The method treats municipal solid waste with harmless and high degree of mechanization in a simple manner.    DETAILED DESCRIPTION - Decomposing and treating municipal solid waste, comprises: (a) selecting a rough garbage, and sorting the rough garbage into organic substance and inorganic substance; (b) selecting the organic matters, sorting the organic matters into an inferior quality organic matters and superior organic matters, selecting the inorganic matters for roughing, and sorting the roughed inorganic matters into a nonmagnetic material and a magnetic material; (c) cleaning the inferior organic matters, and sterilizing and crushing the cleaned inferior organic matters into a fertilizer; (d) cleaning the superior organic matters, sterilizing and fermenting the cleaned superior organic matters into static disinfection hair alcohol, grinding and stirring the fermented superior organic matters to prepare feed, and packing and selling the feed; (e) selecting the nonmagnetic materials to an infrared ray detection, mechanical vibration or pneumatic, sorting the nonmagnetic materials into plastic, aluminum, copper, iron, sandy soil, paper, glass, and 5% of non-recoverable material, selecting and cleaning the magnetic materials, sorting the magnetic materials into aluminum, copper and iron, sterilizing and crushing the cleaned magnetic materials; and (g) cleaning the crushed magnetic materials and drying the cleaned magnetic materials, and packaging and selling the dried magnetic materials.