NOVELTY - Low-temperature splitting and high-temperature vaporizing biomass, comprises: (a) putting the crushed biomass material into a cracking furnace; (b) cooling and separating the generated ash slag containing coke to separate out the component of coke; (c) transmitting the separated out coke and the generated synthetic air into the gasification furnace, carrying out gasification on the crude synthetic gas and the coke, generating into synthetic air; and (d) orderly cooling, de-dusting, acid eliminating, and drying the primary synthetic air to obtain pure synthetic air.    USE - The process is useful for low-temperature splitting and high-temperature vaporizing biomass (claimed).    ADVANTAGE - The process has easy control, low energy consumption and investment, high cooled coal gas efficiency, big heat value of the generated synthetic air, and no tar and alkali metal compound.    DETAILED DESCRIPTION - Low-temperature splitting and high-temperature vaporizing biomass, comprises: (a) putting the crushed biomass material into a cracking furnace, spraying into low-temperature overheated steam into the cracking furnace, keeping operation temperature in the cracking furnace at 500-800 degrees C, splitting the biomass material fuel in the course of being contacted with the low-temperature overheated steam, generating crude synthetic air and ash slag containing coke; (b) cooling and separating the generated ash slag containing coke to separate out the component of coke; (c) transmitting the separated out coke and the generated synthetic air into the gasification furnace, spraying high-temperature overheated steam into the gasification furnace, keeping operation temperature of the gasification furnace at 1200-1600 degrees C, carrying out gasification on the crude synthetic gas and the coke in the course of being contacted with the high-temperature overheated steam, generating into synthetic air; and (d) orderly cooling, de-dusting, acid eliminating, and drying the primary synthetic air to obtain pure synthetic air. An INDEPENDENT CLAIM is a device for low-temperature splitting and high-temperature vaporizing biomass, comprising a cracking furnace (5), a gasification furnace (9), a low-temperature plasma torch heater (8), a high-temperature plasma torch heater (10), a water storage tank (17), a water transporting pump (16), and a heat exchanger (11); where the water storage tank (17) is connected with the water feeding inlet of the heat exchanger (11) by the water transporting pump (16); the steam outlet of the heat exchanger (11) is connected with the inlets of the low-temperature plasma torch heater (8) and the high-temperature plasma torch heater (10); the steam outlet of the low-temperature plasma torch heater (8) is connected with a steam nozzle of the cracking furnace (5); the outlet of the high-temperature plasma torch heater (10) is connected with a steam nozzle of the gasification furnace (9); the outlet of the cracking furnace (5) is connected with the inlet of the gasification furnace (9); the slag discharging opening of the cracking furnace (5) is connected with the slag feeding opening of a slag cooler (6); the slag discharging opening of the slag cooler (6) is connected with the inlet of an ash carbon separator (7); the outlet of the gasification furnace (9) is connected with the air inlet of the heat exchanger (11); and the air outlet of the heat exchanger (11) is connected in serial with a dust remover (12), an acid eliminating tower (13), and a drying tower (14).    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the device for low-temperature splitting and high-temperature vaporizing biomass.    Cracking furnace (5)    Low-temperature plasma torch heater (8)    Gasification furnace (9)    High-temperature plasma torch heater (10)    Heat exchanger (11)    Water transporting pump (16)    Water storage tank (17)