NOVELTY - Method for energy utilization of carbon dioxide zero-emission type organic wastes, involves collecting several organic wastes and storing the collected wastes in storage tank, performing anaerobic fermentation hydrogen generation and hydrogen purification, performing methane fermentation for hydrogen production residual waste and removing carbon dioxide, performing methane liquid processing and microalgae carbon dioxide fixation, performing methane processing and energy grass planting and drying the methane slag.    USE - The method is useful for energy utilization of carbon dioxide zero-emission type organic wastes.    ADVANTAGE - The method reduces the discharge of carbon dioxide and greenhouse gases and thus is environmentally-friendly.    DETAILED DESCRIPTION - Method for energy utilization of carbon dioxide zero-emission type organic wastes, involves (a) collecting several organic wastes and storing the collected wastes in storage tank, performing pre-treatment of edulcoration using the pre-treatment device, and crushing and degritting several organic wastes to the particle size of 20 mm, (b) performing anaerobic fermentation hydrogen generation and hydrogen purification by mixing organic wastes, entering the waste into anaerobic hydrogen generation reactor, controlling the temperature of the anaerobic fermentation hydrogen generation reaction at 30-56 degrees C and pH at 4.5-6.5, and performing the process for 2-5 days, fermenting the organic waste using hydrolysis hydrogen production and acid production bacteria and generating hydrogen and carbon dioxide, performing methane fermentation for hydrogen production residual waste and removing carbon dioxide, water and mixture of hydrogen and carbon dioxide by carbon dioxide absorption liquid and gas-liquid separator to obtain the pure hydrogen, where the saturated carbon dioxide absorption liquid is regenerated by heating and air blowing processes, and dehydrating the carbon dioxide and air emitted from the absorption liquid by the gas-water separator and storing the obtained product in carbon dioxide storage tank, (c) mixing the hydrogen production residual and the methane production inoculum, placing the obtained mixture in the anaerobic methane generation reactor, generating the methane using methane generation bacteria at 30-56 degrees C and at pH of 6.5-7.8 for 10-30 days, where the residues obtained from methane fermentation enters through solid-liquid separator to separate methane slag and methane liquid, desulfurizing generated methane to perform methane electricity generation, and condensing and dehydrating the gas discharged by the methane electricity generation and storing the obtained product in carbon dioxide storage tank, (d) performing methane liquid processing and microalgae carbon dioxide fixation by directly using the methane liquid obtained from the solid-liquid separator as the holozoic culture medium of the microalgae, mixing the methane liquid and liquid containing inoculum of microalgae, placing the obtained mixture in photobioreactor and using carbon dioxide from the carbon dioxide storage tank as the carbon source, culturing the microalgae in the mode of photosynthetic growing fixation carbon dioxide and controlling the microalgae culture at 20-40 degrees C and the illumination intensity of 1000-8000 lux, performing illumination for 24 hours continuously by the sunshine or artificial light source, adjusting the air proportion of the culture, controlling the carbon dioxide concentration of the incoming gas at 1-40%, performing culture process for 2-4 weeks, performing air flotation process for the microalgae liquid, concerning the microalgae slurry having high concentration as raw material of the anaerobic fermentation hydrogen generation and methane fermentation and storing the slurry in raw material storage tank and concerning the dilute microalgae liquid having low concentration as the inoculating micro microalgae liquid, (e) performing methane processing and energy grass planting by drying and crushing the methane slag obtained from the solid-liquid separator, passing on the obtained materials to the energy source grass planting base to be the solid organic fertilizer, harvesting the energy grass, concerning the energy grass to be the raw material of the anaerobic fermentation hydrogen generation and methane fermentation, and storing in raw material storage tank, and (f) recycling mass of waste heat generated by the methane electricity generation by the waste heat recycling system, for heat increasing and heat preservation of the anaerobic hydrogen generation reactor, heat increasing and heat preservation of the anaerobic methane generation reactor, heat increasing and heat preservation of the photobioreactor and drying the methane slag.