The invention discloses an aspergillus niger strain and use thereof. The aspergillus niger strain is aspergillus niger A46CGMCC No.3084. The strain can produce xylanase, cellulose, pectinase, amylase, beta-mannase and the like with high yield at the same time of xylanase, cellulose, pectinase, amylase, beta-mannase and the like at the same time, as well as an enzyme complex for feeding animals, wherein the optimum pH for active enzymes in the enzyme complex is between 4 and 6 which meets the requirements of the gastrointestinal tracts of the animals. The enzyme complex for feed use can be widely used in livestock feed to reduce anti-nutritional factors, improve the digestibility, create excellent economic benefits and promote ecological environment protection and the sound development of the livestock industry.