NOVELTY - Anaerobic fermentation of kitchen waste to generate marsh gas involves forming biomass waste having liquefying enzyme/saccharifying enzyme/cellulase enzyme/lipase enzyme, and forming complex enzyme preparation by adding each gram of biomass waste liquefying enzyme/saccharifying enzyme/cellulase enzyme/lipase enzyme; selecting non-biomass in kitchen waste to sorting and recycling by manual or mechanical method, into composite enzymolysis process; homogenizing the waste after separation, and crushing biomass; homogenizing; enzymolysis; and carrying out anaerobic fermentation.    USE - For anaerobic fermentation of kitchen waste to generate marsh gas (claimed).    ADVANTAGE - The present method provides stable operation; generates high-efficient marsh gas; provides improved production rate and yield; and shortens the fermentation time.    DETAILED DESCRIPTION - Anaerobic fermentation of kitchen waste to generate marsh gas involves: (a) forming biomass waste comprising liquefying enzyme (2000 U/ml), saccharifying enzyme (100000 U/ml), cellulase enzyme (60000 U/ml) and lipase enzyme (20000 U/g); and forming complex enzyme preparation by adding each gram of biomass waste liquefying enzyme (6-10 U), saccharifying enzyme (50-200 U), cellulase enzyme (20-50 U) and lipase enzyme (50-200 U), where the oil content of the kitchen waste is less than 1%; (b) selecting the non-biomass parts in the kitchen waste to sorting and recycling, by manual or mechanical method into the composite enzymolysis process; (c) homogenizing the kitchen waste after sorting and crushing biomass to paste, again homogenizing for further use; (d) crushing the kitchen waste biomass after homogenizing, where oil content of the kitchen waste is 1-5%, firstly adding lipase enzyme, then carrying enzymolysis at a temperature of 25-50 degrees C for 12-36 hours and pH of 5.5-7.5, then adding liquefying enzyme, saccharifying enzyme and cellulase enzyme, then carrying enzymolysis at temperature of 50-70 degrees C for 2-4 hours and pH of 4-6.5, where the oil content of the kitchen waste is less than 1%, homogenizing and crushing the kitchen waste biomass; and (e) then finally carried out anaerobic fermentation at 35-40 degrees C.