Full-immersion type water electrolysis hydrogen production system adopting external circulation evaporative cooling and using method of full-immersion type water electrolysis hydrogen production system

The invention discloses a full-immersion type water electrolysis hydrogen production system adopting external circulation evaporative cooling, and relates to the technical field of hydrogen energy. The system comprises a water sealing container, a water electrolysis hydrogen production system, an evaporative cooling system and a water replenishing system, wherein the water electrolysis hydrogen production system is immersed in cooling water in the water sealing container; the evaporative cooling system comprises an evaporative cooler, a cooling water outlet and a cooling water inlet, the cooling water outlet is connected with the water sealing container, and the cooling water inlet passes through a cooling circulating pump; and the water supplementing system comprises a water supplementing tank and a first water supplementing pipe. According to the system, a full immersion type and a vertical array are combined to optimize the electrolytic hydrogen production heat dissipation effect, and cooling water is evap