A method for producing synthetic gas from biomass by high temperature gasification, comprising: - feeding dried biomass as raw material into a pressurization feeding system, - transporting the dried biomass to a carbonization furnace by pneumatic booster technology, - introducing an external combustible gas and external oxygen via pipes into the carbonization furnace for conducting a combustion reaction, - controlling the temperature of the carbonization furnace to a temperature between 400 °C and 600 °C by adjusting the input amount of external oxygen, - controlling the temperature of a burner nozzle of the carbonization furnace to a temperature less than 1800 °C by adjusting the input amount of the external combustible gas between 1 and 5 times that required for complete combustion with the external oxygen, - the products of the carbonization furnace being pyrolysis gas comprising CO, H 2, CO 2, H 2 O, and CH 4, and charcoal, - reducing the temperature of the charcoal produced In the carbonization furnace to a working temperature of a decompression feeding system for reducing pressure. - decompressing the charcoal in the decompression feeding system, - pulverizing the decompressed charcoal in a pulverizer to charcoal powder, - transporting the charcoal powder to a pressurization feeding system for increasing the pressure of the pulverized charcoal via a normal pressure pneumatic transportation system, - increasing the pressure of the charcoal powder to a working pressure of a gasification furnace for gasification by pneumatic booster technology, and - transporting the pressurized charcoal powder to the gasification furnace. - feeding dried biomass as raw material into a pressurization feeding system, - transporting the dried biomass to a carbonization furnace by pneumatic booster technology, - introducing an external combustible gas and external oxygen via pipes into the carbonization furnace for conducting a combustion reaction, - controlling the temperature of the carbonization furnace to a temperature between 400 °C and 600 °C by adjusting the input amount of external oxygen, - controlling the temperature of a burner nozzle of the carbonization furnace to a temperature less than 1800 °C by adjusting the input amount of the external combustible gas between 1 and 5 times that required for complete combustion with the external oxygen, - the products of the carbonization furnace being pyrolysis gas comprising CO, H 2, CO 2, H 2 O, and CH 4, and charcoal, - reducing the temperature of the charcoal produced In the carbonization furnace to a working temperature of a decompression feeding system for reducing pressure. - decompressing the charcoal in the decompression feeding system, - pulverizing the decompressed charcoal in a pulverizer to charcoal powder, - transporting the charcoal powder to a pressurization feeding system for increasing the pressure of the pulverized charcoal via a normal pressure pneumatic transportation system, - increasing the pressure of the charcoal powder to a working pressure of a gasification furnace for gasification by pneumatic booster technology, and - transporting the pressurized charcoal powder to the gasification furnace.