TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred System: The hydrogen generation reaction section comprises: a closed reactor for containing the liquid mixture of formic acid and an ionic liquid; heating unit for heating the liquid mixture of formic acid and an ionic liquid in the reactor; and a spreading section for expanding the surface area of the liquid mixture of formic acid and an ionic liquid in the reactor, and the reactor has a mixture outlet for sending out the mixture of hydrogen and carbon dioxide generated through the reaction in the reactor to the separation section. The separation section comprises a water container for containing water through which the mixture of hydrogen and carbon dioxide passes and in which the carbon dioxide is dissolved; and a gas-liquid interface increasing section provided in the water container for increasing contact interfaces between the mixture and the water in the water container, where the water container has an outlet for sending out the hydrogen outside the system after separated by dissolving the carbon dioxide into water. The spreading section has a spreading wall movably provided in the reactor to contact with the liquid mixture of formic acid and an ionic liquid; and drive unit for moving the spreading wall, and the movement of the spreading wall raises the liquid mixture of formic acid and an ionic liquid above the liquid level and causes the liquid mixture to run along a surface of the spreading wall. The spreading section has at least one spreading wall stood in the reactor; and a liquid circulation line for pumping up the liquid mixture of formic acid and an ionic liquid from a bottom of the reactor to an upper part of each spreading wall, and the liquid mixture of formic acid and an ionic liquid runs along surfaces of each spreading wall. The gas-liquid interface increasing section has a filter through which hydrogen and carbon dioxide can pass, where the filter provided in the water container to form compartments, and the carbon dioxide in the mixture is dissolved into the water to be separated from the hydrogen as the mixture consecutively passes through the water in the compartments. The separation section additionally comprises a water temperature adjustment mechanism for cooling and heating water in the water container in a switching manner; and a selector valve provided at the outlet for changing the sending out direction, and the carbon dioxide is dissolved into the water to separate the hydrogen as the mixture passes through the water in the water container cooled by the water temperature adjustment mechanism, and the hydrogen separated is sent out to the external hydrogen destination through the outlet, and then ports of the selector valve are changed, the carbon dioxide is generated with the water temperature adjustment mechanism, by heating the water in which carbon dioxide is dissolved, and the carbon dioxide is sent outside the system through the outlet. The system additionally comprises formic acid storage section for storing formic acid supplied externally, so that formic acid is supplied from the formic acid storage section to the hydrogen generation reaction section. Preferred Components: The ionic liquid is of formula R1-P+(R3)(R4)-R2 Z-. The phosphonium cation is tetraphenylphosphonium salt, trihexyltetradecylphosphonium salt or tetrabutylphosphonium salt. The ionic liquid includes at least one of HCOO-, CF3SO3-, 1C-, NO3-, and para-toluenesulfonate ion as counter anion.R1-R4=alkyl (optionally substituted with halo), or (hetero)aryl (optionally substituted at the o-position or the p-position with 1-3 halogen atoms, lower alkyl or lower alkoxy) (preferably 4-20C alkyl or 4-20C aryl);Z1=counter anion for phosphonium cation.Preferred Method: The heating temperature of the liquid mixture of formic acid and an ionic liquid is normal temperature to 200 degrees C. The formic acid and the ionic liquid are mixed at a mole ratio of 1:15 to 20:1. EXAMPLE - No suitable example given.