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This invention discloses a liquid hydrogen storage and supply system and method for rapid emission, belonging to the field of hydrogen-air fuel cell technology. The system includes an inner liquid hydrogen tank, an outer liquid hydrogen tank, a booster vaporizer, a vaporizer, a fuel cell, air lines, a booster line, an venting line, and liquid hydrogen lines. Several sealed compartments are provided between the inner wall of the outer liquid hydrogen tank and the outer wall of the inner liquid hydrogen tank; each sealed compartment contains an inner heat-conducting arm, an outer heat-conducting arm, and a mounting frame. This liquid hydrogen supply and storage system employs pneumatically driven inner and outer heat-conducting arms, rapidly transferring external heat to the inner liquid hydrogen tank to achieve rapid emission of liquid hydrogen. Furthermore, the sealed compartments are evacuated and purged via air lines, allowing the entire system to be reused, improving efficiency and economy.