The present invention relates to a method for mixing and processing sprouted whole grain mixture. More particularly, the method includes sprouting whole grains such as brown rice, wheat, barley, oat, Sorghum, etc., and mixing and processing the sprouted whole grains at a time. The mixing and processing process of the whole grains include: (i) steaming the sprouted whole grains to gelatinize the same (in α state); (ii) primary drying; (iii) milling; (iv) baking; and (v) secondary drying of the whole grains. The whole grains according to the present invention maintain gelatinization of starch (in α state), thereby providing soft texture. Further, the whole grains are sugar-free and additive-free while minimizing loss of physiological active ingredients such as dietary fiber, GABA, etc., thereby being helpful in preventing adult disease and promoting health.