The invention discloses a processing method of infantile nutrient rice flour, and relates to the technical field of processing of infantile foods. The processing method comprises the following steps: firstly cleaning early long-sharped rice, drying the cleaned early long-sharped rice, crushing the dried early long-sharped rice with a crusher, screening the crushed early long-sharped rice, and performing enzyme treatment through basic protein so as to obtain early long-sharped rice flour; adding walnuts, lotus seeds, peanuts, black sesame seed and wheat germ powder, steaming the early long-sharped rice flour, the walnuts, the lotus seeds, the peanuts, the black sesame seed and the wheat germ powder so as to obtain a mixture, adding fish meat powder, vegetable and fruit powder, tea polyphenol and cod-liver oil, uniformly and thoroughly mixing the mixture, the fish meat powder, the vegetable and fruit powder, the tea polyphenol and the cod-liver oil so as to obtain mixed materials, freeze drying the mixed materials, screening the dried mixed materials, vacuum packing the screened mixed materials, and finally sterilizing the packed mixed materials under superhigh pressure so as to obtain finished products of the rice flour. The infantile nutrient rice flour processed by the processing method disclosed by the invention uses the early long-sharped rice as a main raw material, and the infantile nutrient rice flour is soft, fine and smooth in mouth feel and easy to digest, so that the infantile nutrient rice flour is more suitable for intestines and stomachs of babies than other grains; in addition, deep sea fish meat, vegetables and fruits are added, so that the infantile nutrient rice flour contributes to balancing nutrition, improving immunity and promoting the development of infantile brains, and the infantile nutrient rice flour is suitable for babies of 6-12 months.