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The invention discloses a production method of low-molecular-weight nutritional protein powder, which comprises the following steps: taking soy protein powder and whey protein powder as raw materials; adding water whose the temperature is 70-90 DEG C, and mixing the mixture into uniform suspension; filtering the suspension through a filtration film under the temperature no less than 60 DEG C, to be specific, firstly filtering the suspension through a 5,000-daltonian filtration film and then filtering the filtrate through a 500-daltonian filtration film; spraying and drying the obtained filtrate; adding sprayed and dried lecithin whose powder weight is 0.5-1.5%; and uniformly mixing the mixture. According to the production method of low-molecular-weight nutritional protein powder, the prepared protein powder has the advantages that the molecular weight is small, the composition of gamma-aminobutyric acid is scientific and reasonable, and is easy to absorb, the appearance is pure white and attractive, and no bean fishy smell and milk fishy smell can be generated; and the powder is easily dissolved into water, can be more quickly dissolved in cold water, is easy to disperse, and is particularly suitable for people who are lack of protein or feeble and sick, and tumor patients.