NOVELTY - Method for preparing energy chemical substances using lignocellulosic biomass, involves (a) crushing lignocellulosic biomass feedstock, (b) adding aqueous solution of sulfuric acid and sodium hydroxide to crushed biomass, processing the mixture, filtering the mixture, and adjusting pH of the filtrate, (c) adding solid material and sodium hydroxide to the xylose hydrolyzate, processing the mixture, filtering the mixture, and washing the mixture, and (d) adding hydrochloric acid to the cellulose material, adjusting pH, and filtering the mixture.    USE - The method is useful for preparing energy chemical substances using lignocellulosic biomass (claimed).    ADVANTAGE - The method provides high yield.    DETAILED DESCRIPTION - Method for preparing energy chemical substances using lignocellulosic biomass, involves (a) crushing lignocellulosic biomass feedstock to 10-60 mesh, or diameter of 0.5-2 mm and length of 1-5 mm, (b) adding 0.02-0.5 mol/l aqueous solution of sulfuric acid and sodium hydroxide in a weight ratio of 1:15 to crushed biomass, processing the mixture at 50-120 degrees C for 1-24 hours, filtering the mixture, and adjusting pH of the filtrate to 6-7 to obtain xylose hydrolyzate, (c) adding solid material and sodium hydroxide in a weight ratio of 1:4-1:15 to the xylose hydrolyzate, processing the mixture at 20-80 degrees C for 1-24 hours, filtering the mixture, and washing the mixture to obtain cellulose material, and (d) adding hydrochloric acid to the cellulose material, adjusting pH of the mixture to 5-7, and filtering the mixture to obtain solid lignin products. The step (b) involves steaming xylose hydrolyzate in pressure cooker for 0.5-3 hours, cooling the steamed product under sterile conditions, inoculating Clostridium acetobutylicum into the cooled mixture, fermenting the mixture at 36-39 degrees C for 48-72 hours, adding mixture containing n-butanol, acetone and ethanol, and performing distillation to obtain n-butanol, acetone and ethanol. The catalytic conversion process is carried out in closed pressure vessel. The nickel-ruthenium bimetallic catalysts and bimetallic active component are jointly supported on activated carbon carrier. The method involves reacting the mixture at 225-255 degrees C and 4-12 MPa for 1-2.5 hours, where the concentration of the cellulose material is 10-20 wt.%.