The present invention relates to a method for pulverizing grains into powder using a cryogenic micro grinding technology (CMGT), thereby improving the nutrient retention rate and the body digestibility of the grains. The method includes: a step of immersing one grain selected from the group consisting of germinated brown rice, black beans, and a germinated grain and vegetable mixture in water at 2 to 4°Cfor 100 to 150 minutes； a step of freezing and pulverizing the immersed grain at a temperature of -80 to -50°C to an average particle size of 5 to 30 μm； and a step of freeze-drying the pulverized grain at -80 to -20°C.본 발명은 극저온 초미세 분쇄법(Cryogenic Micro Grinding Technology: CMGT)을 이용하여 곡물을 분쇄함으로써 곡물의 영양성분 보존율을 향상시키고 체내 소화율을 향상시키는 방법에 관한 것이다.
