NOVELTY - A hydrogen gas generation system is provided to mass-produce hydrogen gas of high quality by enabling smooth water inflow and prompt gas exhaust so as to generate a large amount of hydrogen gas using a small amount of electric power.    DETAILED DESCRIPTION - The hydrogen gas generation system comprises a cooling distilled water vat(100) at the upper part of which a hopper(110) is installed, on one side of which a distilled water supply pipe(120) is installed to store distilled water, and which is equipped with a water level controller(130) so that a certain amount of cooling water is contained in the cooling distilled water vat(100); an electrolytic cell(200) which is coupled to one side end of the distilled water supply pipe(120), and at the other side of which a hydrogen gas supply pipe is installed so that hydrogen gas is generated from distilled water supplied from the cooling distilled water vat(100) by first electrode plates that are connected in tandem; a water cooling gas cooler(300) to the lower part of which the hydrogen gas supply pipe is coupled, to the upper part of which a gas transfer pipe(310) is connected to transfer a gas, and at the lower and upper parts of which cooling water transfer pipes(320) are installed for inflow and discharging of cooling water, thereby cooling the hydrogen gas; a water supply vat(400) which lowers a temperature of the hydrogen gas supplied through the gas transfer pipe(310), to one side of which a gas exhaust pipe(400) is installed to transfer hydrogen gas for using as a fuel, which supplies distilled water into the electrolytic cell(200) through the distilled water supply pipe(120), and at a certain position of which a water level controller(410) is installed; a distilled water conversion part(600) supplying distilled water by water supplied into 100% distilled water; and an air cooling cooler(700) consisting of a cylindrical case(710) on which cooling coils(720) are formed with spaced apart from the hopper(110) in a certain distance so as to cool the distilled water flown into through the water supply vat(400), electrolytic cell(200) and distilled water conversion part(600).