NOVELTY - Fuel ethanol and 2,3-butanediol production involves removing impurities from the fibrous substance and grinding the fibrous substance. The ground fibrous substance is mixed with reaction liquid in a solid-liquid ratio of 1:15-1:25. The mixture is put in a closed reactor and is pre-treated for 8-13 hours at 60-80 degrees C. Water is used to wash the raw material to neutralize it and is put into xylanase enzymatic buffering aqueous solution having a pH of 4.5-5.5 based on the solid-liquid ratio of 10:1-25:1.    USE - Method for producing fuel ethanol and 2,3-butanediol (claimed).    ADVANTAGE - The fuel ethanol and 2,3-butanediol production method effectively transforms fibrin and hemicellulose, improves the utilization rate of raw material of fibrin ethanol, thus reduces cost of raw materials, and provides 2,3-butanediol having high added value.    DETAILED DESCRIPTION - Fuel ethanol and 2,3-butanediol production involves removing impurities from the fibrous substance and grinding the fibrous substance. The ground fibrous substance is mixed with reaction liquid in a solid-liquid ratio of 1:15-1:25. The mixture is put in a closed reactor and is pre-treated for 8-13 hours at 60-80 degrees C. Water is used to wash the raw material to neutralize it and is put into xylanase enzymatic buffering aqueous solution having a pH of 4.5-5.5 based on the solid-liquid ratio of 10:1-25:1. 90IU-200 International Units per g of xylanase is added to the mixture as activator and enzymolysis is performed for 36-72 hours at 45-55 degrees C to obtain enzymatically hydrolyzing system of xylanase. Solid-liquid separation is carried out for enzymatically hydrolyzing system of xylanase to obtain the xylose hydrolyzate and fibrin slag. 2,3-butanediol of xylose hydrolyzate is fermented and obtained xylose hydrolyzate is evaporated and condensed. The initial sugar concentration is regulated at 60 g per l and nutritive materials are supplemented by Klebsiella pneumnoiae (CICC 10011). Fermentation is carried out in batches to produce 2,3-butanediol. Cellulose and alcohol active dry yeast are added to the obtained fibrin slag and supplemented with nutritive materials, and synchronous diastatic fermentation is carried out to produce the fuel ethanol.