Two-stage biochemical treatment method for kitchen waste

The invention relates to a two-stage biochemical treatment method for kitchen waste. The two-stage biochemical treatment method comprises the following steps: pretreatment: crushing the kitchen waste to fine particles, spraying with hot water, screening, carrying out solid-liquid separation and dissolving out organic components, sorting out impurities and delivering; adjustment: separating oil from water in the washed residue solution of the kitchen waste; hydrolytic acidification: carrying out hydrolytic acidification on the macromolecular slightly-soluble organic matters, turning the organic matters to micromolecular soluble matters, and meanwhile degrading a part of organic matters; anaerobic fermentation: decomposing and transforming the organic matters to biogas; purification and collection: purifying the biogas, dehydrating and desulfurizing the purified biogas, and storing; discharging the sludge into a sludge tank, filter pressing, biologically drying the sludge, and obtaining a soil conditioner. The