NOVELTY - A comprehensive utilization of lignocellulosic biomass involves a) carrying out multi-stage acid hydrolysis of the lignocellulosic biomass to form pentose solution and acid hydrolysis residue (G2); b) using cellulase to carry out enzymolysis of (G2) to obtain glucose solution and enzymolysis residue (R1); and c) processing (R1) with a base so as to extract alkali lignin solution from (R1).    USE - For converting lignocellulosic biomass into pentose and glucose (claimed).    ADVANTAGE - The method is simple and it makes maximum utilization of the lignocellulosic biomass resource. The use of multi-stage acid hydrolysis can extract hemicellulose, at the same time causes as little as possible damage of the lignin and cellulose, preserves the activity of the lignin, and further reduces the usage amount of acid and alkali, and also saves the cost and reduces the pollution to the environment. As the structure of the lignin is not damaged, the activity of lignin extracted by the alkali solution is high, and it can be directly used for production of other products with high added value (such as phenolic resin) as raw material, on the other hand, generating the acid solution in the process of enzyme inhibitor, also improves the extraction rate of the cellulose. It is economic (as it has low equipment investment and simple operation).The damage rate of cellulase is low, as it prevents generation of furfural and acetic acid.    DETAILED DESCRIPTION - A comprehensive utilization of lignocellulosic biomass, involves    (A) multi-stage (1st to n) acid hydrolysis of the lignocellulosic biomass, where the reaction kettles for acid hydrolysis are connected end to end, and the acid solution is added to the first stage hydrolyzing reaction kettle, that is discharged to the second hydrolysis reaction kettle and so on till the (n-1)th stage reaction kettle, the acid solution from (n-1)th stage kettle is discharged into the n stage hydrolyzing reaction kettle, from which the acid solution is discharged as final pentose solution, followed by taking out acid hydrolysis slag from the first stage acid hydrolysis reactor; placing new lignocellulosic biomass raw material, to the first stage hydrolyzing reaction kettle and carrying out hydrolysis reaction in circulation to hydrolyse the lignocellulosic biomass;    (B) using cellulase to carry out enzymolysis of the acid hydrolysis slag to obtain glucose solution and enzymolysis residue; and    (C) processing the enzymolysis residue with a base to extract the alkali lignin solution from the enzymolysis residue.