Mobile hydrogen supply system and hydrogen supply method for spaceflight hydrogen fuel engine test

The invention discloses a spaceflight hydrogen fuel engine test mobile hydrogen supply system and a hydrogen supply method. The hydrogen supply system comprises a hydrogen source, a temperature rise module, a pressure reduction module and an emptying module. An outlet of the hydrogen source is connected with an inlet of the heating module; an outlet of the heating module is connected with an inlet of the pressure reduction module; one end of the emptying module is connected to a pipeline between an outlet of the heating module and an inlet of the pressure reducing module, and the other end of the emptying module is connected to a pipeline at an outlet of the pressure reducing module; the heating module comprises a tank body, a hydrogen conveying channel is arranged in the tank body, and a plurality of baffle plates are arranged on the outer side of the hydrogen conveying channel of the tank body and used for forming a water flow channel. The hydrogen supply device has the advantages of simple structure, large