The invention discloses a series of nutritional synergism-type bean sprout fermented milk beverages and a preparation technology thereof. The bean sprout fermented milk beverages comprise bean sproutmilk, skimmed milk, white granulated sugar, glucose, lactic acid bacteria, sodium citrate and the like. The preparation method comprises the following steps of selecting raw materials, performing germination, performing grinding to obtain pulp, performing filtration, performing defatting, performing mixing, performing homogenizing, performing sterilization, performing cooling, performing inoculation, performing fermentation, performing after-ripening, performing cold storage and the like. Leuconostoc mesenteroides fermentation is used for the first time, so that the beany flavor of bean products can be weakened, and the preparation technology is simple and high in efficiency. The prepared series of fermented bean sprout milk beverages are novel vegetable protein beverages concurrently having mouth feel, flavor and health-care nutritive functions, and a favorable development idea is provided for efficient utilization of the nutrients of bean type foods such as soybeans.