NOVELTY - Preparing hydrogen gas and nutrient solution using municipal domestic rubbish and agricultural waste comprises (i) sorting rubbish, separating and removing anaerobic fermenting raw material from rubbish; (ii) crushing, and adjusting pH; (iii) mixing the crushed material and water, and fermenting to obtain marsh gas; (iv) decarburizing; (v) obtaining fine desulfurization agent; (vi) reacting methane and water vapor to hydrogen and carbon monoxide; (vii) obtaining hydrogen and carbon dioxide; (viii) obtaining carbonate; and (ix) filtering the slurry, concentrating, and packaging.    USE - The method is useful for preparing hydrogen gas and nutrient solution using municipal domestic rubbish and agricultural waste (claimed).    ADVANTAGE - The method: reduces air and soil pollution; and produces the nutrient solution for providing nutrition during soilless cultivation, promoting organic vegetable industry and increasing revenue to farmers.    DETAILED DESCRIPTION - Preparing hydrogen gas and nutrient solution using municipal domestic rubbish and agricultural waste comprises (i) sorting rubbish, separating and removing anaerobic fermenting raw material from rubbish; (ii) crushing the fermentation raw material using a crusher, using industrial acetic acid or lime water for processing, and adjusting pH value; (iii) mixing the crushed ferment raw material and water, regulating total solid substance concentration to 8-12%, conveying into an anaerobic fermentation tank, performing wet-fermentation at 35 plus minus 2 degrees C to obtain marsh gas, or regulating total solid substance concentration to 20-35%, conveying into the anaerobic fermentation tank, performing dry-fermentation at 55 plus minus 2 degrees C to obtain marsh gas, at the same time, using agricultural waste for preparing biogas and carbonate; (iv) carrying out hydrogen sulfide and carbon dioxide removing treatment, obtaining treated biogas comprising methane and water vapor as main component, where the hydrogen sulfide treatment is performed by iron oxide dry desulfurization or sodium carbonate wet removing hydrogen sulfide process, and the carbon dioxide removal treatment is performed by decarburizing using a decarbonization tower; (v) using cobalt-molybdenum (CO-Mo) catalyst or nickel-molybdenum (Ni-Mo) catalyst for carrying out hydrogenation on biogas to obtain fine desulfurization agent; (vi) using a converting furnace, reacting methane and water vapor to hydrogen and carbon monoxide; (vii) reacting with carbon monoxide with water vapor to obtain hydrogen and carbon dioxide; (viii) conveying the hydrogen and carbon dioxide to methyldiethanolamine (MDEA)/diethanolamine (DEA)/monoethanolamine (MEA) decarburizing tower through a compressor to remove the carbon dioxide, removing of carbon dioxide from marsh gas, conveying into a carbonization tower, reacting with strong base to obtain carbonate, using hydrogen to obtain power fuel, or preparing compressed hydrogen, or preparing liquefied hydrogen; and (ix) preparing the biogas residue into organic fertilizer, filtering the slurry, concentrating, reducing nutrient substance in biogas liquid, which is 8-10 times of liquid volume, and packaging using a rubber bucket to obtain plant nutrition liquid.