NOVELTY - A movable hydrogen (engine fuel) preparation system comprises booster pump, engine, movable hydrogen generation device, fuel evaporating heat exchanger and carbon dioxide removal system. An air exhaust pipe of engine is directly connected with air inlet pipe of movable hydrogen generation device. A reformed gas catalyzed and converted in catalyzed reaction cavity of movable hydrogen generation device is fed to air inlet distributor of absorber of carbon dioxide removal system through air cooling and reforming pipe.    USE - A movable hydrogen (engine fuel) preparation system.    ADVANTAGE - The reformation system does not involve water evaporation process, so that special water tank or use of fuel containing water is not required, thus avoiding scaling and providing long continuous travel period, high waste heat utilization ratio of engine and low production cost.    DETAILED DESCRIPTION - A movable hydrogen (engine fuel) preparation system comprises booster pump, engine, movable hydrogen generation device, fuel evaporating heat exchanger and carbon dioxide removal system. An air exhaust pipe of engine is directly connected with air inlet pipe of movable hydrogen generation device. A reformed gas catalyzed and converted in catalyzed reaction cavity of movable hydrogen generation device is fed to air inlet distributor of absorber of carbon dioxide removal system through air cooling and reforming pipe after guiding to hot flow passage of fuel evaporating heat exchanger through air reforming pipe. A purified fuel gas obtained after carbon dioxide removal is guided into low pressure fuel gas pipe and is fed into low pressure side of booster pump through absorber. The hydrogen-rich mixed gas is transported to fuel gas inlet of engine through fuel gas pipe. A branch point on air exhaust pipe of engine is connected with direct-exhaust and flow-dividing pipe. The liquid fuel from fuel pipe enters cold flow passage of fuel evaporating heat exchanger through fuel pump; enters desulfurization chamber through fuel steam pipe; and enters air inlet pipe of movable hydrogen generation device through desulfurization fuel steam pipe. The hydrogen (engine fuel) is prepared by directly regenerating water. INDEPENDENT CLAIMS are included for:    (1) a carbon dioxide removal system;    (2) a fuel buffer bypass system;    (3) a fuel gas buffer system; and    (4) control method of movable hydrogen (engine fuel) preparation system.