NOVELTY - A biomass gasifying device comprises a fan, an air generator, an air buffer tank I, a filtering system, a pressure container, a user-terminal gas pipeline network, a liquid ring compressor, and a gas-water separator; where the liquid ring compressor is assembled with a pressure balancing tube; the air generator, air buffer tank, filtering system, liquid ring compressor, gas-water separator, and pressure container are orderly connected with gas pipeline; and the pressure container is connected with the user-terminal gas pipeline network through a pressure-reducing valve.    USE - The biomass gasifying device is useful for actualizing gasification and channel formation of biomass waste in countryside.    ADVANTAGE - The biomass gasifying device converts biomass material with low heat value and waste into clean and environment friendly biomass fuel gas with high heat value, has a more reasonable and compact structure, and takes small floor space. Moreover, it has an easier, more efficient and safer technique, obtains cleaner and pollution-free fuel gas with a higher purity, and solves the separation problem of wood tar to effectively prevent corrosion, blockage and pollution inside the pipeline.    DETAILED DESCRIPTION - A biomass gasifying device comprises a fan, an air generator, an air buffer tank I, a filtering system, a pressure container, a user-terminal gas pipeline network, a liquid ring compressor, and a gas-water separator; where the liquid ring compressor is assembled with a pressure balancing tube; the fan communicates with the bottom of the air generator; the air generator, air buffer tank, filtering system, liquid ring compressor, gas-water separator, and pressure container are orderly connected with gas pipeline; the pressure container is connected with the user-terminal gas pipeline network through a pressure-reducing valve; one end of the pressure balancing tube is connected with gas pipeline at air inlet of the liquid ring compressor and the other end of it is connected with air pipeline of the air outlet of the gas-water separator; and the gas-water separator is set with a drain valve and a liquid level gauge. An INDEPENDENT CLAIM is a biomass gasifying technique comprising: (a) generation of fuel gas: taking crop waste and organic rubbish as materials, drying until the water content is less than or equal to 20%, processing anoxic combustion under the action of fan to generate combustible gases comprising carbon monoxide (CO), hydrogen gas (H2), methane (CH4), ethane (C2H6), and foggy wood tar gas; (b) purification and filtration of fuel gas: letting the generated fuel gas enter the gas buffer tank I through gas pipeline under draught action of the liquid ring compressor to cool automatically and deposit impurities, absorbing and depositing the water filter through gas pipeline and various impurities comprising dust and wood tar in the fuel gas, letting the gas enter the water sprayer to remove impurities, letting it enter the gas buffer tank II again to deposit and enter the gas-water separator through gas pipeline to separate gas from water; and processing periodically the pollution discharging and water draining treatments; and (3) compression and storage of fuel gas: processing the purified fuel gas with gas and water separation and secondary dry filtration through the gas-water separator under the action of the liquid ring compressor, compressing and storing in the pressure container; where the air displacement of the liquid ring compressor is 90-1,800 m3/h; and the maximum pressure is 0.6 MPa; and continuously draining water with gas-water separator according to the display of the liquid level gauge.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of the biomass gasifying device.