NOVELTY - Hydrogenating alkaline microorganism by electrolysis, comprises (i) starting the electrolysis basin in the microbial fuel cell mode, mixing organic waste water with nutrition solution A, adjusting pH, adding organism substrate to obtain mixed solution B, adding it in the electrolysis basin, connecting resistor, changing reactor solution, and (ii) changing cathode, separating electrolysis basin, adjusting pH of nutrition solution A, adding organism substrate, adding mixed solution in the electrolysis basin as electrolyte, passing voltage to cathode and anode, and hydrogenating.    USE - The method is useful for hydrogenating alkaline microorganism by electrolysis.    ADVANTAGE - The method can efficiently inhibit the methane production and operates for long time continuously in multiple batches; produces output gas of less methane content; is economical; can obtain high hydrogen production rate; and can improve the utilization rate of organic matter to improve the hydrogenation stability of the system.    DETAILED DESCRIPTION - Hydrogenating alkaline microorganism by electrolysis, comprises (i) starting the electrolysis basin in the microbial fuel cell mode, mixing the organic waste water with the nutrition solution A according to 1:1 of volume ratio, adjusting pH of the mixed solution to 9-12 by using alkaline solution, adding organism substrate according to 1 g/l of ratio to obtain the mixed solution B, adding the mixed solution B in the electrolysis basin, connecting a 1000 ohm resistor in the system closed loop, when the voltages on the two ends of the resistor are less than 20 mV, changing the solution in the electrolysis basin by new mixed solution B, changing continuously the reactor solution until the voltages on the two ends of the resistor are more than 500 mV, and ending the anode start, and (ii) changing the cathode of the started electrolysis basin by stainless steel mesh or foam nickel, separating electrolysis basin using air by cover plate so that the whole electrolysis basin solution is in the anaerobic state, adjusting pH of nutrition solution A to 9-12 by alkaline solution, adding organism substrate according to 0.5-8 g/l of ratio, adding mixed solution in the electrolysis basin as the electrolyte, passing 0.4-0.8 V of voltage on the two ends of the cathode and anode of the electrolysis basin by the direct current (DC) power supply, and hydrogenating in the electrolysis basin at 20-35 degrees C, where each liter of nutrition solution A is composed of sodium bicarbonate (8.4 g), ammonium chloride (0.31 g), potassium chloride (0.13 g), micro element solution (2 ml), and residual distilled water, the micro element solution uses the water as the solvent, where each solution comprises biotin (2 mg), vitamin B (2 mg), vitamin B6 (10 mg), riboflavin (5 mg), thiamine (5mg), nicotinic acid (5 mg), vitamin B3 (5 mg), vitamin B-12 (0.1 mg), p-aminobenzoic acid (5 mg), lipoic acid (5 mg), nitrilotriacetic acid (1.5 g), magnesium sulfate (3 g), manganese sulfate monohydrate (0.5 g), sodium chloride (1 g), ferrous sulfate heptahydrate (0.1 g), calcium chloride dihydrate (0.1 g), cobalt chloride hexahydrate (0.1 g), zinc chloride (0.13 g), copper sulfate pentahydrate (0.01 g), aluminum potassium sulfate dodecahydrate (0.01 g), hydrogen borate (0.01 g), sodium molybdate (0.025 g), nickel chloride hexahydrate (0.024 g), and sodium tungstate dihydrate (0.025 g); the used electrolysis basin is a single-chamber electrolysis basin composed of a battery casing, an anode and an air cathode; anode is the activated carbon brush composed of a titanium wire and an activated carbon fiber; the air cathode is a carbon cloth coated with the dispersion layer and the granular activated carbon catalysis layer on the two sides; the dispersion layer faces to the air; the activated carbon catalysis layer faces to the electrolysis solution.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the microbial fuel cell.