The invention discloses high-protein fermented soybean meal and a preparation method of the high-protein fermented soybean meal, and belongs to the field of animal feeds. The preparation method of the high-protein fermented soybean meal comprises the following steps: grinding soybean meal raw materials, adding water to carry out sterilization, adding a compound enzyme preparation to carry out enzymatic hydrolysis, after the enzymatic hydrolysis is carried out for a period of time, adding activated lactic acid bacteria or yeast simultaneously, performing semi-solid state fermentation, and then solid-liquid separation, drying and grinding to obtain the high-protein fermented soybean meal; the compound enzyme preparation contains alpha-galactosidase, cellulase, xylanase, pectinase, beta-mannase and beta-glucanase. According to the invention, through the specific composition and addition amount of the compound enzyme preparation, the synergism among various enzymes and a method of combining adding of the compound enzyme preparation with mixed fermentation, the content of non-starch polysaccharides can be reduced to 8% to 10%, the protein content reaches up to 60.2%, essential amino acids are overall improved by 22.41%, other various indexes obviously become better, and the method disclosed by the invention plays an important role in improving the quality of the soybean meal.