The invention relates to the preparing method of the health-care nourishment mung bean flour, comprising the steps of: preliminary cleaning, frying, secondary preliminary cleaning, peeling, grinding, sieving, adding auxiliary materials, adding probiotics and nitrogen-filled packing. The prepared mung bean flour of this invention contains high quality protein, carotene, crude fiber and mineral phosphorus. The high quality protein can improve the disease resistance and rehabilitation ability of the body. Vegetarian diet with carotene can prevent the synthesis of carcinogenic substances, reduce the formation of cancer cells, and reduce the incidence of human cancers. The added probiotics can reduce intestinal pH, regulate intestinal activity, and improve human immunity. Vitamin D can promote calcium absorption, promote bone growth and prevent bone transport. The product not only maintains the unique flavor and nutrients of soybeans, but also provides more delicate taste of mung bean flour with more mellow taste.