Seawater electrolysis hydrogen production device and preparation method thereof

The invention discloses a seawater electrolysis hydrogen production device and a preparation method thereof, and the seawater electrolysis hydrogen production device comprises an electric control system, an alkaline water hydrogen production electrolytic tank, a seawater alkali liquor tank, a hydrogen side gas-liquid separator, an oxygen side gas-liquid separator, a hydrogen side washing tower, an oxygen side washing tower, an alkali liquor circulating pump, a washing water pump and a seawater filter, the oxygen side heat exchanger core, the seawater circulating pump and the electric control system control the device to work. Waste heat generated by hydrogen production through alkaline water electrolysis is fully utilized to pretreat seawater to prepare washing water, energy is effectively utilized, and hydrogen production energy consumption is reduced; meanwhile, supplementary fresh water needed in the hydrogen production process is obtained, the influence of seawater impurity corrosion, deposition and the l