The invention relates to the technical field of ferment, especifically relates to a method for procuding aspergillus oryzae of xylanase capable of efficiently degrading feed substrate and xylanase. According to the strain aspergillus oryzae Y-1 with a preservation number CGMCC NO.6842 of xylanase capable of efficiently degrading feed substrate, the xylanase produced by the aspergillus oryzae Y-1 provided by the invention is capable of efficiently degrading feed and evidently improving the reproducing performance of animals, waste water and waste residue are not produced in the process of production, and no secondary pollution of the environment is caused. Accordingly the device for producing xylanase is simple, the producing cost is low, the xylanase can be used as feed additive of birds, livestocks and aquaculture animals and has wide a application range.