Black beans and soybeans are close relatives and belong to the soybean family, but there are differences in varieties and similar nutritional components. Therefore, black soybean milk and yellow soybean milk are rich in nutrients such as protein, potassium, magnesium, calcium and B vitamins, as well as soluble dietary fiber and isoflavones. The difference is that soybean milk contains a small amount of carotene, while black soybean milk contains chlorophyll and melanin, which are beneficial to health. The contents of protein, potassium and vitamins in black beans are slightly higher than those in soybeans, which have stronger functions of clearing fire, benefiting water and resisting oxidation, so drinking black bean milk is better.