NOVELTY - System for producing hydrogen via gasifying biomass, comprises an air reacting device, a fuel reacting device, a movable bed gasifying furnace, a gas-solid separating device a, a gas-solid separating device b, a gas-solid separating device c, a gas purifying device, a hydrogen separating device, an utilizing device a and an utilizing device b. The mobile bed gasifying furnace is connected with an inlet of the gas-solid separating device c. A gas outlet of the gas-solid separating device c is orderly connected in series with the gas purifying device and the hydrogen separating device.    USE - The system is useful for producing hydrogen via gasifying biomass.    ADVANTAGE - The system produces hydrogen with low cost and with complete carbon dioxide exhaust. The biomass can be efficiently cleaned and utilized.    DETAILED DESCRIPTION - System for producing hydrogen via gasifying biomass, comprises an air reacting device, a fuel reacting device, a movable bed gasifying furnace, a gas-solid separating device a, a gas-solid separating device b, a gas-solid separating device c, a gas purifying device, a hydrogen separating device, an utilizing device a and an utilizing device b. The mobile bed gasifying furnace is connected with an inlet of the gas-solid separating device c. A gas outlet of the gas-solid separating device c is orderly connected in series with the gas purifying device and the hydrogen separating device. The hydrogen separating device functions in separating hydrogen and little hydrogen flammable gas. A solid outlet of the gas-solid separating device c is connected with the mobile bed gasifying furnace via a conveying control device. The movable bed gasifying furnace is connected with the air reacting device via the conveying control device. The air reacting device is connected with the inlet of the gas-solid separating device a. The air outlet of the gas-solid separating device a is connected with subsequent utilizing device a. The solid outlet of the gas-solid separating device a is connected with the fuel reacting device via the conveying control device. The little hydrogen flammable gas outlet of the hydrogen separating device is connected with the fuel reacting device. The fuel reacting device is connected with the inlet of the gas-solid separating device b. The gas outlet of the gas-solid separating device b is connected with the subsequent utilizing device b. The solid outlet of the gas-solid separating device b is connected with the movable bed gasifying furnace via the conveying control device. An INDEPENDENT CLAIM is also included for producing hydrogen via gasifying biomass, comprising: adding the biomass to the movable bed gasifying furnace, gasifying at 400-700 degrees C in a steam, separating hydrogen in the hydrogen separating device to obtain the high purity hydrogen, conveying separated partial reacted kernel and flying ash to the movable bed gasifying furnace via the conveying control device via the gas-solid separating device c so as to fully utilize the heat, conveying the metal or low valent metallic oxide in the mobile bed gasifying furnace into the air reacting device to oxidize and regenerate via the conveying control device. The metal or low valent metallic oxide from the mobile bed gasifying furnace to the air reacting device is reacted with the air in the air reacting device at 800-1000 degrees C to obtain high valent metallic oxide, the oxygen-poor air separated via the gas-solid separating device a is utilized in subsequent utilizing device a. The re-oxidized high valent metallic oxide separated from the air reacting device is conveyed to the fuel reacting device via the conveying control device via the gas-solid separating device a. The little hydrogen flammable fuel obtained via separating hydrogen via the hydrogen separating device is fed to the fuel reacting device to react with the high valent metallic oxide in the fuel reacting device at 700-1000 degrees C so as to obtain the metal or low valent metallic oxide. The reacted smoke is conveyed to the subsequent utilizing device b to fully utilize heat. The smoke can be further condensed to obtain carbon dioxide with high consistency. The metal or low valent metallic oxide obtained via reducing little hydrogen flammable fuel is conveyed into the movable bed gasifying furnace to circularly utilize via the conveying control device via the gas-solid separating device b and partial heat is supplied to gasify.