NOVELTY - Combined pre-treatment method, involves adding diluted sulfuric acid to bagasse, filtering the mixture, subjecting the bagasse to vapor explosion treatment, washing soluble hydrolyzate of the treated bagasse using hot water, filtering the solution, mixing the bagasse with a lower alcohol-alkaline water system, extracting the mixture, filtering the extract to obtain extraction residue, adding acetic acid-sodium acetate buffer solution to the residue, and enzymolyzing the solution to obtain sacchariferous liquor.    USE - The combined pre-treatment method is useful for separating bagasse biomass component.    ADVANTAGE - The method improves enzymolysis efficiency, and conversion rate and the utilization ratio of bagasse biomass resources.    DETAILED DESCRIPTION - Combined pre-treatment method, involves (a) adding diluted sulfuric acid (0.1-1%) to bagasse having water content of 0-15% in the solid to liquid ratio of 1:30-60, stirring the mixture, soaking the mixture for 20-60 minutes, filtering the mixture, and separating the filtrate, (b) subjecting the bagasse to a vapor explosion tank for vapor explosion treatment under vapor pressure of 1.5-2 MPa, where holding time is 2-10 minutes after pressure stabilization and instantaneous depressed discharge is performed to implement explosion and separation, (c) adding hot water of 45-70 degrees C to the treated bagasse in the solid to liquid ratio of 1:10-30, washing soluble hydrolyzate in the bagasse for 1-3 times, filtering the solution, and separating the filtrate, (d) mixing the washed bagasse with a lower alcohol-alkaline water system in the ratio of solid to liquid ratio of 1:20-50, adding the mixture in a reaction kettle, performing high temperature stirred extraction of the mixture for 10-90 minutes at 110-190 degrees C, cooling the extract, filtering the cooled extract, and separating the filtrate to obtain extraction residue, and (e) adding acetic acid-sodium acetate buffer solution to the extraction residue to adjust final concentration of the extraction residue to 2-8 wt.%, adding cellulase to the extraction residue simultaneously, stirring the solution, and performing enzymolysis of the solution at constant temperature of 46-50 degrees C to obtain sacchariferous liquor.