NOVELTY - Producing multi-element sugar alcohol and lignin by using agriculture and forestry waste of comprehensive technique using corn core comprises: (a) crushing and using diluted acid to the agriculture and forestry waste that is less than 10 meshes for the preprocessing mode; (b) pre-treating corn core as raw material through cleaning, high temperature cooking or steam explosion of the hemicellulose hydrolysis; (c) taking solid fermentation method to produce enzyme solution of xylanase; and (d) cooking the mixture.    USE - The process is useful for producing multi-element sugar alcohol and lignin by using agriculture and forestry waste of comprehensive technique using corn core (claimed).    ADVANTAGE - The process provides comprehensive technique using corn core (claimed).    DETAILED DESCRIPTION - Producing multi-element sugar alcohol and lignin by using agriculture and forestry waste of comprehensive technique using corn core comprises: (a) crushing and using diluted acid to the agriculture and forestry waste that is less than 10 meshes for the preprocessing mode, or using white rot fungus, brown rot bacteria to proceed biological method by pretreating lignin in biomass degradation, where the dipping method is the method of soak solution is at least one of diluted sulfuric acid, diluted hydrochloric acid or diluted acid is mass percentage in the dilute oxalic acid is 0.1-0.5%, the soaking temperature is 3 to 100 degrees C, and the dipping time is 6 to 24 hours, after soaking, the corn core filtering and washing until the pH is more than 5, the humidity control interface in advance of white rot fungus cultivated or brown rot bacteria seed liquid of the corn core is 50% to 80%, the inoculation quantity is 5 ml/g of corn core dry weight, solid fermentation culture temperature is 28 degrees C, pre-processing time is 14 to 40 days, the following solid-to-liquid ratio has no special explanation, all on a dry basis; (b) pre-treating corn core as raw material through cleaning, high temperature cooking or steam explosion of the hemicellulose hydrolysis, each to a severe degree of hydrolysis and especially is divided into A, B two kinds of reaction condition, high temperature cooking A, solid-to-liquid ratio is 1:5 to 20, the stewing time is 5 to 2 hours, the stirring speed is 80-150 revolutions per minute (rpm), then the hydrolysis is finished cooking to obtain mixture A, high temperature cooking B, solid-to-liquid ratio is 1:5 to 20, the stewing time is 5 to 2 hours, the stirring speed is 80-150 rpm, after hydrolysis to obtain mixture B; and A steam explosion, steam pressure is 2 MPa, pressure maintaining time is 2 to 8 minutes, the steam explosion B: steam pressure is 0.5 MPa, pressure maintaining time is 2 to 8 minutes; (c) taking solid fermentation method to produce enzyme solution of xylanase, xylanase producing strain is Aspergillus niger, Trichoderma viride, and Trichoderma reesei in the A; and (d) cooking the mixture B, using the self-made enzyme solution in step (c) to carry out enzymolysis.