NOVELTY - A biomass gas technology, comprises a biomass gasification gas purification, heating working medium, heating marsh gas generator, gas collecting, the marsh gas generator is a marsh gas tank or marsh gas tank.    USE - The biomass gas technology is useful for processing biomass fuel gas.    ADVANTAGE - The biomass gas technology is cost effective and time efficient.    DETAILED DESCRIPTION - A biomass gas technology, comprises a biomass gasification gas purification, heating working medium, heating marsh gas generator, gas collecting, the marsh gas generator is a marsh gas tank or marsh gas tank, comprises the following steps: (1) putting the biomass into the biomass gasification reaction, a gasification reaction process technology using pyrolysis or gasification method to generate heat value which is 800-3000 kcal/Nm3 into the gasification device, the temperature is 450 degrees C high temperature gasification gas is 1200 degrees C, the gasification device is fixed bed, fluidized bed or entrained flow bed device; (2) the generated high temperature gasification gas is directly sent to the catcher to remove dust or tar in the gasified gas to form purified gasification gas at 15-1200 degrees C; (3) a process of heating medium in the insulating interlayer of the marsh gas generator through the working medium after heating, to heat the marsh gas generator, the working medium is purified gasification gas or other working medium, the other working medium is air, water or oil, if the working medium is pure gasification gas, where the temperature is 15-1200 degrees C, where purified gasification gas is directly introduced into the heat preservation interlayer and rod of the marsh gas generator, the gas generator temperature is 10-60 degrees C, where the normal temperature range is 10-30 degrees C, the middle temperature fermenting range is 30-45 degrees C, and fermenting it at high temperature which is at 45-60 degrees C, if it is other working medium, using 450-1200 degrees C high temperature gasification gas to process medium is heated to 15-1200 degrees C in a heat exchanger, and the whole or a part of the heated working medium into the heat preservation interlayer and rod of the marsh gas generator, the gas generator at a constant temperature in 1-30 degrees C, 30-45 degrees C or 45-60 degrees C; and (4) fully mixing the purified gasification gas and marsh gas to the air storage tank to generate mixed gas of 2000-5000 kcal/Nm3.