The invention relates to a method for producing beta-mannase through sporosarcina sp. bacteria, in particular to the method for producing the beta-mannase through bacteria. The new method for producing the beta-mannase through the bacteria aims to expand the source of microorganism bacteria for producing the beta-mannase. The method includes the steps that 1, the sporosarcina sp. bacteria HDYM-15 is inoculated into a konjaku flour culture medium, the initial cell concentration in the culture medium is (1.5-2.5)*107 piece/ml; 2, culturing is conducted for 36 hours to 72 hours under the conditions that the temperature ranges from 30 DEG C to 35 DEG C, and the rotating speed of a shaking table ranges from 100 rpm to 140 rpm, fermentation liquor is obtained, the fermentation liquor is extracted, and the beta-mannase is obtained, wherein the activity of the beta-mannase in the fermentation liquor reaches 2200 U/ml to 3200 U/ml. By means of the method, the fermentation cycle is short, the cost is low, and operation is easy and convenient to conduct. The method is used for producing the beta-mannase.