NOVELTY - A hydrogen is produced by electrolyzing water in electrolysis bath (2) to obtain hydrogen and oxygen, making electrolyzed hydrogen and oxygen enter to first-level hydrogen-water separator (3) and first-level oxygen-water separator (4), and making hydrogen and oxygen to escape from top of first-level hydrogen-water separator and first-level oxygen-water separator and to enter second-level hydrogen-water separator (5) and second-level oxygen-water separator (6) to separate gas and water when electrolyte is separated partly.    USE - Production of hydrogen.    ADVANTAGE - The method has no electrolyte loss, reduces production cost, improves yield of hydrogen and oxygen, has no environment pollution, reduces power consumption of oxyhydrogen machine, and saves energy.    DETAILED DESCRIPTION - A hydrogen is produced by electrolyzing water in electrolysis bath (2) to obtain hydrogen and oxygen, making electrolyzed hydrogen and oxygen enter to first-level hydrogen-water separator (3) and first-level oxygen-water separator (4), making hydrogen and oxygen to escape from top of first-level hydrogen-water separator and first-level oxygen-water separator and to enter second-level hydrogen-water separator (5) and second-level oxygen-water separator (6) to separate gas and water when electrolyte is separated partly, flowing out hydrogen and oxygen from top of second-level hydrogen-water separator and second-level oxygen-water separator and entering to storing or using device, making separated electrolyte on lower part of second-level hydrogen-water separator and second-level oxygen-water separator to enter electrolyte storing tank (1), and pressurizing electrolyte in the storing tank by electrolyte supply pump and supplying to first-level hydrogen-water separator and first-level oxygen-water separator.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic block diagram of production method of hydrogen.    Electrolyte storing tank (1)    Electrolysis bath (2)    First-level hydrogen-water separator (3)    First-level oxygen-water separator (4)    Second-level hydrogen-water separator (5)    Second-level oxygen-water separator (6)