A hydrogen energy supply system including 10 or more water wheel impeller type power generation devices that are supported to float in water by first floating bodies and generate electric power by using ocean currents; a second floating body on which a seawater electrolysis device, a hydrogen liquefaction device, and a liquid hydrogen tank are arranged; a hydrogen transporting ship that accommodates the liquid hydrogen stored in the liquid hydrogen tank and transports it by sea to land; an overland liquid hydrogen tank that stores the liquid hydrogen supplied from the hydrogen transporting ship; a small cylinder that accommodates the liquid hydrogen supplied from the overland liquid hydrogen tank; and a hydrogen transporting vehicle that transports the small cylinder to a consumer on land.
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