NOVELTY - Producing biodiesel by using kitchen garbage, comprises: (a) removing solid impurities in kitchen garbage; (b) adding water to the kitchen garbage to pulp, adjusting the pH value to be weakly acidic, sterilizing; (c) inoculating yeast cells to the uniform kitchen garbage paste; (d) collecting the yeast cells; (e) crushing the yeast cells; (f) adding the crushed cells to extraction solvent, leaching, collecting the upper organic solvent so as to obtain mixed oil, evaporating and recycling the solvent in the mixed oil to obtain microbial grease; and (g) obtaining biodiesel.    USE - The method is useful for producing biodiesel by using kitchen garbage (claimed).    ADVANTAGE - The microbial fermentation method is used for converting the organic component in the kitchen garbage into microbial grease so as to prepare biodiesel; the problem that the raw material source is insufficient when swill-cooked dirty oil is used for preparing the biodiesel can be solved; thus, the method for producing biodiesel by using kitchen garbage of the invention lays the foundation on the recycling utilization of the kitchen garbage and the industrial development of the biodiesel.    DETAILED DESCRIPTION - Producing biodiesel by using kitchen garbage, comprises: (a) removing solid impurities in kitchen garbage; (b) adding water to the kitchen garbage obtained in (a) to pulp, adjusting the pH value to be weakly acidic, sterilizing; (c) inoculating yeast cells to the uniform kitchen garbage paste obtained in (b) to execute liquid fermentation, ventilating at 25-30 degrees C to blend and ferment for 70-75 hours; (d) collecting the yeast cells after the fermentation liquor obtained in (c) is filtered; (e) crushing the yeast cells obtained in (d) by using a high-pressure homogenizer; (f) adding the crushed cells obtained in (e) to extraction solvent, leaching, collecting the upper organic solvent so as to obtain mixed oil, evaporating and recycling the solvent in the mixed oil to obtain microbial grease; and (g) obtaining biodiesel after executing a methyl ester reaction on the microbial grease.