NOVELTY - Use of kitchen waste for pollution free preparation of biodiesel, glycerol, humic acid, bioethanol and an organic fertilizer, is claimed. The method comprises collecting kitchen waste for de-oiling process, removing oil, water and other impurities with ethanol, purifying and separating glycerine and biodiesel, taking oil residues, separating to obtain ethanol, separating humic acid solid-liquid mixture by distillation to obtain bioethanol, removing the solid through catalysis, performing polycondensation and purification to obtain humic acid, and drying the solid to obtain organic fertilizer.    USE - The kitchen waste is useful for preparing biodiesel, glycerol, humic acid, biological ethanol and an organic fertilizer without pollution (claimed).    ADVANTAGE - The method: solves the kitchen waste as a secondary resource to be disposed completely; does not produce waste water and solid waste; and saves energy.    DETAILED DESCRIPTION - Use of kitchen waste for pollution free preparation of biodiesel, glycerol, humic acid, bioethanol and an organic fertilizer, is claimed. The preparation method comprises taking kitchen waste oil, waste cooking oil, waste fried oil and collecting the kitchen waste, utilizing a de-oiling device, a diatomite filter, nano silicon dioxide, a humic acid exchange device, a distillation device, a separation device, a purifying device, a dissolving kettle, humic substance saccharification kettle, an ethanol jar, a solid-liquid separation device, a catalytic device, polycondensation device and an aerobic fermentation tank, respectively preparing biodiesel, glycerol, humic acid and bioethanol with different plants, collecting kitchen waste for de-oiling process, removing the separated oil, water and other impurities in the kitchen waste extract with ethanol to carry out resin exchange, purifying and separating the glycerine and biodiesel, taking the oil residues, separating to obtain oil-containing kitchen waste and simultaneously obtaining ethanol, separating humic acid solid-liquid mixture by distillation to obtain bioethanol, performing solid liquid separation to the mixture, removing the solid through catalysis, polycondensation, and purifying to obtain humic acid, and drying the solid to obtain organic fertilizer by fermentation.