The invention relates to a 
biomass poly-generation comprehensive utilization method and device. The method comprises the steps of: naturally 
drying and roughly crushing 
biomass materials, then carrying out 
microwave heating and 
cracking in a 
microwave pyrolysis chamber, introducing thermal gas (
tar) and 
solid semicoke which are generated by 
microwave heating and 
cracking into a microwave reforming chamber, and further carrying out microwave heating and reforming on the thermal gas (
tar) to convert the thermal gas (
tar) into synthesis gas under the catalytic reaction of the semicoke; activating and regenerating the semicoke after 
catalysis and reforming, and then sending to the microwave reforming chamber for continuous catalytic reaction. In the invention, directional conversion from 
biomass to synthesis gas is realized by means of microwave 
radiation, the semicoke generated by 
pyrolysis is used as a reforming catalyst, two technologies of 
microwave pyrolysis and microwave reforming are integrated, and the semicoke can be activated and regenerated for recycling under microwave 
radiation. The semicoke that is not suitable for recycling can also be returned to field directly or in the form of a compound 
fertilizer after being mixed with 
fertilizer to improve 
soil carbon sink and enhance 
soil fertility. Compared with other processes, the method has the 
advantage of high synthesis gas conversion rate improved by about 10%; the prepared synthesis gas has wide applications and can be used for synthesizing 
chemical products such as 
ammonia, 
dimethyl ether, 
fertilizer and the like. The method can realize the resource poly-generation comprehensive utilization of biomass.