The invention relates to functional five-cereal bean milk as well as a production technology thereof, and belongs to the technical field of beverage processing. The production technology of the functional five-cereal bean milk is characterized by comprising the following steps: mixing baked germinated brown rice and germinated soybeans to pulp by taking the germinated soybeans and the germinated rice as main raw materials, pulping corns, oat, barley, buckwheat, Awadani, mung beans and red beans respectively, compounding, adding a sweetening agent, a stabilizing agent and an emulsifying agent, then homogenizing, degassing, sterilizing, cooling and performing sterile filling, thereby preparing the functional five-cereal bean milk. According to the invention, all the germinated soybeans and brown rice grains are utilized; the application fields of corns, oat, barley, buckwheat, Awadani, mung beans and red beans are widened; the functional five-cereal bean milk is unique in flavor, fine and smooth in mouthfeel, balanced in nutrition and rich in beneficial components of gamma-aminobutyric acid (GABA), dietary fibers and the like, and has the efficacies of resisting oxidation, improving the immunity of organism, relaxing bowels, building body, losing weight, reducing blood pressure, improving sleep and the like, and the content of GABA in the functional five-cereal bean milk is 10-15 mg/100mL.