The invention discloses a preparation method of 
selenium-enriched germinated 
brown rice mung bean milk 
powder rich in gamma-
aminobutyric acid. 
Mung bean, germinated 
brown rice and leaves of 
moringa oleifera are taken as raw materials, and 
brown rice is treated through the processes of 
germination, 
selenium enrichment, low-temperature 
microwave drying, puffing and the like, so that the problems ofunpleasant smell of brown rice and low 
palatability, low processability and low digestibility of brown rice are solved, the content of organic 
selenium and gamma- 
aminobutyric acid in the germinated brown rice is high, and the selenium-enriching effect is excellent; in the process of 
mung bean cooing, the 
hardness of well-cooked 
mung bean is lowest after 
sodium bicarbonate is added, milk grindingis facilitated, and the 
milk yield is high; and the bean milk 
powder prepared by mixing the raw materials is simple and feasible in process, the cost is reduced, the yield of the bean milk 
powder is high, the finished product is easy to brew, the instant performance is high, and the bean milk powder is rich in 
nutrition, has the health-care functions of mung bean, germinated brown rice and leavesof 
moringa oleifera, has the special fragrance of the leaves of 
moringa oleifera, is a health product with the effects of reducing pressure, resisting 
ageing, resisting oxidation, and resisting tumor,and has a wide market prospect.