Pretreatment method for preparing biomass sugar from straw corn cob residues

The invention relates to the technical field of biochemical engineering, in particular to a pretreatment method for preparing biomass sugar from straw corn cob residues. According to the method, the corn cob residues obtained after hemicellulose is removed are treated, powder of the corn cob residues can be obtained through smashing and screening in the process, and the reaction speed can be increased in the subsequent organic acid treatment process; under the condition that nitric acid serves as a catalyst, formic acid-acetic acid mixed liquid is adopted for treating the corn cob residue powder, a mixed acid treatment mode is adopted, functional groups of methoxyl and carboxyl can be introduced into lignin, and lignin with better organic solvent solubility and alkali solubility can be obtained; and then in the subsequent solid-liquid separation process, cellulose with higher purity is obtained, and subsequent preparation of biomass sugar with higher purity is facilitated. 本发明涉及生物化工技术领域，具体涉及一种秸秆木糖渣制备生物质糖的预处理方