NOVELTY - High-fiber aquatic plant is enzymolyzed by cleaning, freeze-drying, crushing, mixing in reaction tank with degrading enzyme, adding water, treating anaerobically, removing, cooling to room temperature, placing in enzymatic anaerobic pre-treatment fermentation tank, adding anaerobic activated sludge, passing nitrogen or argon, maintaining temperature at 30-50 degrees C with pH of 4.5-6.5 and stirring speed of 80-180 rpm, and allowing hydrogen production, maintaining temperature at 30-50 degrees C with pH of 7-8 and stirring speed of 80-180 rpm, allowing methane production, and terminating reaction.    USE - Enzymolysis of high-fiber aquatic plant for biogas production of hydrogen and methane (claimed).    ADVANTAGE - The enzymolysis of high-fiber aquatic plant is simple, mild, environment-friendly, energy-saving, improves adsorption of bioenzymes and microorganism selectivity, improves hydrogen and methane production, shortens reactor starting time, and effectively reduces bio-fill and toxic waste.    DETAILED DESCRIPTION - High-fiber aquatic plant is enzymolyzed by cleaning, freeze-drying, crushing to particles size of 0.2-1 cm, mixing in reaction tank with degrading enzyme with mass ratio 1:1-15:1 mg/g, adding water of 0.5-5 times volume, treating anaerobically at 35-55 degrees C for 12-48 hours, removing, cooling to room temperature, placing in enzymatic anaerobic pre-treatment fermentation tank, adding 10-30 wt.% anaerobic activated sludge, passing nitrogen or argon for 2-10 minutes to remove air, maintaining temperature at 30-50 degrees C with pH of 4.5-6.5 and stirring speed of 80-180 rpm, and allowing hydrogen production for 7-15 days, maintaining temperature at 30-50 degrees C with pH of 7-8 and stirring speed of 80-180 rpm, allowing methane production for 7-15 days, and terminating reaction.    DESCRIPTION OF DRAWING(S) - The drawing shows a flowchart of biogas production of hydrogen and methane using high fiber aquatic plant. (Drawing includes non-English language text).