NOVELTY - A kitchen garbage processing method involves separating kitchen garbage, crushing material through pulping machine to obtain slurry, passing garbage slurry to feeding tank by pump, passing to self-absorbing tank, carrying out fermentation, after fermentation, subjecting slurry to supercritical CO2 extraction method for extracting grease in extraction tank, subjecting grease substance in the fermentation system for anaerobic fermentation to obtain biogas, and passing biogas via gas separating device for marsh gas separation and purification to obtain methane and CO2 in extracting tank.    USE - As kitchen garbage processing method to form fertilizer (claimed).    ADVANTAGE - The method provides improved kitchen garbage processing method. The intermediate product formed during the process can be readily recycled using separated biogas residue. The method avoids secondary environmental pollution thereby providing good environmental protection.    DETAILED DESCRIPTION - A kitchen garbage processing method involves separating kitchen garbage, crushing garbage material from restaurant through pulping machine to obtain slurry, passing the garbage slurry to a feeding tank by a pump, passing to self-absorbing tank, carrying out fermentation, after the fermentation, subjecting the garbage slurry to supercritical CO2 extraction method for extracting grease in extraction tank, subjecting the grease substance in the fermentation system for anaerobic fermentation to obtain biogas, and passing the biogas through a gas separating device for marsh gas separation and purification to obtain methane and CO2 in the extracting tank. The method further involves separating solid-liquid product after fermentation by solid-liquid separation system, allowing the biogas slurry to enter into feeding tank and fermenting obtained residue to obtain fertilizer. The solid-liquid separation system is a spiral-flow solid-liquid separating system.    DESCRIPTION OF DRAWING(S) - The figure shows schematic view illustrating method for processing kitchen garbage.