Soybean milk powder without causing abdominal distension and preparation method thereof

Provided are a soybean milk powder without causing abdominal distension and a preparation method thereof, wherein the method comprises the following steps: preparing soybean milk and malt extract into a fermentation culture medium; fermenting by using one or two of kluyveromyces lactis and bacillus coagulans, and decomposing raffinose and stachyose in the soybean milk; and then filtering, concentrating, adding a sweetening agent, sterilizing, homogenizing, drying and the like, and preparing the fermented liquid into soybean milk powder. The soybean milk powder prepared by the invention does not contain raffinose and stachyose, and the soybean milk brewed with water has a strong bean fragrance flavor, and there is no symptoms of abdominal distension after drinking.