NOVELTY - A comprehensive utilization of lignocellulosic biomass involves (a) processing alkaline hydrolysis lignocellulosic biomass with alkali solution, so as to extract the lignin, (b) acid hydrolysis, alkaline hydrolysis residue processing is the alkali solution obtained by carrying out acid hydrolysis to obtain pentose solution and acid hydrolysis residue, (c) using cellulase to carry out enzymolysis to the acid hydrolysis residue to obtain a main component solution of glucose, where the cellulase is obtained by culturing a Penicillium.    USE - As comprehensive utilization of lignocellulosic biomass to extract lignin (claimed).    ADVANTAGE - The method improves the extraction rate of the degradation to realize the lignocellulosic biomass the comprehensive utilization of the resource. The method uses a first alkaline hydrolysis, and acid solution, at last the process route, alkali and acid solution to finish most of hemicellulose and lignin is extracted, cellulose is exposed, so as to eliminate the space disorder, to make the cellulose more easily accessible, improves the conversion rate of the cellulose, at the same time for cultivating a strain of Penicillium cellulose from the cellulose. The penicillin production of cellulase has high activity, which further improves the extraction rate of degradation. Because of the relatively low alkaline solution treatment temperature (40-100 degrees C) to extract the lignin and reduce the damage of the lignin.    DETAILED DESCRIPTION - A comprehensive utilization of lignocellulosic biomass involves (a) processing alkaline hydrolysis lignocellulosic biomass with alkali solution, so as to extract the lignin, (b) acid hydrolysis, alkaline hydrolysis residue processing is the alkali solution obtained by carrying out acid hydrolysis to obtain pentose solution and acid hydrolysis residue, (c) using cellulase to carry out enzymolysis to the acid hydrolysis residue to obtain a main component solution of glucose, where the cellulase obtained by culturing a Penicillium, which is named as Penicillium decumbens ro (G3) 08, and having preservation number CCTCC M2011195.