Method used for producing butanol via enzymolysis and fermentation of lignocellulose

The invention discloses a method used for producing butanol via enzymolysis and fermentation of lignocelluloses. The method comprises following steps: (1) lignocelluloses obtained via pretreatment, cellulose, and butyl acetate are delivered into a reactor at a certain ratio for enzymolysis; (2) pH value of an obtained enzymolysis liquid is adjusted to 6 to 8 with calcium hydroxide, and reaction is carried out for 1h at 50 DEG C; (3) a deoxidant is added into the enzymolysis liquid, and an inert gas is added so as to obtain an oxygen-free system; and (4) the enzymolysis obtained via detoxification is inoculated with a butanol fermentative strain, and butanol is prepared via fermentation. According to the method, an appropriate extraction agent and an appropriate detoxifier are selected for in-suit extraction separation of fermentation inhibitors such as acetic acid, furfural, and hydroxymethylfurfural generated in pretreatment and enzymolysis processes, toxicity of the inhibitors on enzymolysis and fermentatio