The invention relates to diarrhea-preventing digestion-aiding infant formula rice flour and a preparation method thereof. The diarrhea-preventing digestion-aiding infant formula rice flour comprises the following components in parts by weight: 80-90 parts of long-shaped rice, 12-15 parts of milk powder, 10-16 parts of glucose, 6-8 parts of Chinese yam, 3-6 parts of hyacinth bean, 8-10 parts of semen coicis, 4-6 parts of hawthorn, 8-10 parts of malt, 4-7 parts of dried tangerine or orange peel, 8-10 parts of root of kudzu vine and 5-9 parts of liquorice. Every 1kg of the rice flour is further added with 2g-3g of fructo-oligosaccharide, 2.0g-2.5g of calcium gluconate, 20mg-30mg of zinc sulfate, 16mg-20mg of ferrous gluconate, 0.4mg-0.5mg of potassium iodate, 0.42g-0.45g of taurine, 0.3g-0.4g of docosahexenoic acid, 0.1g-0.2g of arachidonic acid, 0.06g-0.07g of vitamin A, 0.06g-0.07g of nicotinic acid, 0.05g-0.06g of vitamin B1, 0.05g-0.06g of vitamin B2, 0.04g-0.05g of vitamin D1, and 0.02mg-0.03mg of beta-carotene. The infant formula rice flour prepared by the preparation method disclosed by the invention not only contains proteins, fat, various vitamins and trace elements needed for the infant, but also has effects of appetizing and digesting, tonifying spleen, preventing diarrhea, and the like. According to the invention, the process is simple, and the prepared product is finer and smoother in mouthfeel, and capable of promoting absorption.