NOVELTY - Biomass processing involves crushing biomass and carrying out pyrolytic reaction for 5-20 minutes at 300-900 degrees C to generate 10-70 wt.% of carbon and 30-90 wt.% of pyrolysis gas. The pyrolysis gas is cooled and gas and liquid are separated from the pyrolysis gas, which is a medium-heating-value gas with a heating value of 4000-5000 kilojoules per kg. The cooled gas is allowed to enter to a gas cabinet to be as fuel of pyrolytic furnace and the liquid is sent to a fractionating tower to carry out separation at a top temperature of 40 degrees C and a bottom temperature of 80-280 degrees C.    USE - Method for processing biomass (claimed).    ADVANTAGE - The biomass processing method is simple, energy saving and eco-friendly, and has economic and social benefits.    DETAILED DESCRIPTION - Biomass processing involves crushing biomass and carrying out pyrolytic reaction for 5-20 minutes at 300-900 degrees C to generate 10-70 wt.% of carbon and 30-90 wt.% of pyrolysis gas. The pyrolysis gas is cooled and gas and liquid are separated from the pyrolysis gas, which is a medium-heating-value gas with a heating value of 4000-5000 kilojoules per kg. The cooled gas is allowed to enter to a gas cabinet to be as fuel of pyrolytic furnace and the liquid is sent to a fractionating tower to carry out separation at a top temperature of 40 degrees C and a bottom temperature of 80-280 degrees C to obtain tar at the bottom of the tower, which is used as fuel of the pyrolytic furnace or is processed to obtain light wood vinegar. The obtained wood vinegar is sent to a liquid storage tank or is stacked with other crushed straw in a weight ratio of 0.5-1:1 for 7-30 days at 10-40 degrees C. The stacked straw is mixed with organic waste or biological sewage in a weight ratio of 0.5-3:0.5-10 and anaerobic digestion is carried out for 7-30 days at 10-60 degrees C to produce biogas, slag and liquid. The biomass is selected from cotton straw, wheat straw, rice straw, bean straw, corn straw, peanut shell, sawdust, wooden meal, branches or mixture. The organic waste is selected from fowl and livestock manure or human manure. The biological sewage is selected from vegetable-washing water, rice-washing water, swill, clothes-washing water or non-toxic industrial waste water.