Kefir yogurt sour soybean milk and production method thereof

The present invention discloses a kefir acid soymilk and a production method thereof. The kefir acid soymilk consists of soybean milk and animal milk which are matched to take effect of the complementation of protein nutrition. The acid soymilk which is produced by fermenting the soybean milk through microorganism not only has the nutrient efficacy of the soybean, but the microorganism fermenting process is also good for eliminating anti-nutritional factors in the soybean, thus improving the nutrient and healthy efficacy on the soybean milk. The kefir acid soymilk has smooth taste, proper acidity, soft flavor and intense bee wine fragrance, besides, aromatic carbonyl compound, phenolic acid substance and the like in the soybean take certain restraining effect on partial microorganism in the kefir. Compared with the traditional kefir, the kefir acid soymilk has the low excitation of the taste, is fit for the taste of most people and reduces the post acidification during storage greatly, and the shelf life is prolonged. The preparation method has low cost, simple operation and high feasibility and has good application prospect.