NOVELTY - A comprehensive utilization of lignocellulosic biomass involves a) dissolving lignocellulosic biomass in alkali solution to form alkaline hydrolysis slag (G1) and liquid; b) carrying out acid hydrolysis of (G1) to form pentose solution and acid hydrolysis residue (G2); c) using cellulase to carry out enzymolysis of (G2) to obtain glucose solution and enzymolysis residue (R1); and d) returning (R1) to step b) for acid hydrolysis or combining (R1) with new hydrolysis residue, and then through steps c) and d) to convert hemicellulose in lignocellulosic biomass into pentose and glucose.    USE - As comprehensive utilization method of lignocellulosic biomass used to produce pentose and glucose (claimed).    ADVANTAGE - The present method realizes maximized use of lignocellulosic biomass source. The present method uses a alkaline hydrolysis, and then acid hydrolysis and enzymolysis, finally the cellulose, hemicellulose to alternately process route of the extraction process. In which process lignocellulosic biomass to obtain a hydrolysis liquid to a separating, condensing and improve the purity of the alkali lignin, which is good for using lignin producing the products with high added value. The present method reduces the ash in the alkali lignin solution and residual alkali solid content, which is more beneficial for using lignin producing the products with high added value. The present method cannot pollute the environment. The present method uses low alkaline solution treatment temperature (40-100 degrees C) to extract the lignin, as a result the damage of the lignin can be reduced.    DETAILED DESCRIPTION - A comprehensive utilization method of lignocellulosic biomass involves: a) dissolving lignocellulosic biomass in alkali solution, filtering, washing to obtain alkaline hydrolysis slag and liquid, separating the obtained liquid by separating device and concentrating to obtain alkali lignin solution; b) carrying out acid hydrolysis of the alkaline hydrolysis slag to obtain pentose solution and acid hydrolysis residue; c) using cellulase to carry out enzymolysis of the acid hydrolysis residue obtained in step b) to obtain glucose solution and enzymolysis residue (R1); and d) returning (R1) to step b) for acid hydrolysis or combining (R1) with new hydrolysis residue, and then through steps c) and d) to convert hemicellulose in the lignocellulosic biomass into pentose and glucose.