Biomass comprehensive utilization process

The invention discloses a biomass comprehensive utilization process, and relates to the technical field of biomass recycling. The method specifically comprises the following steps: taking biomass rich in starch and sugar as a fermentation raw material, preparing ethanol through fermentation, and obtaining lignin residues; the method further comprises the step of gasifying lignin residues and lignocellulose biomass to obtain synthesis gas containing H2, CO and CO2. The synthesis gas can be used for preparing methanol and ethanol, and the synthesis gas and the prepared methanol and ethanol can also be used for preparing industrial products with higher value. According to the method, biomass rich in starch and sugar and lignocellulose biomass are combined for use, lignin residues obtained through fermentation of the biomass rich in starch and sugar and the lignocellulose biomass are gasified together, and the lignin residues are adopted for supplementing a carbon source for synthesis gas obtained through gasific