The invention discloses a preparation method of an oat drink with high
dietary fiber. The method comprises the steps as follows: step 1, selecting oat, removing impurities in oat, cleaning and draining the oat, and performing high-
pressure cooking; step 2, adding a proper amount of water to the cooked oat, adding the oat in a
colloid mill to be crushed 2 times to obtain a thick oat liquid; step 3,adding medium temperature
amylase with the content 1% of that of the oat to the thick oat liquid for enzymolysis at 50 DEG C for 30 min, and increasing the temperature to 90 DEG C for
enzyme deactivation for 10 min after enzymolysis; step 4, removing insoluble substances by
centrifugation to obtain stable oat juice; step 5, adding
inulin to the oat juice, performing uniform stirring, and adding water to determine the volume according to the 4%-5% of oat and 2% of
inulin; and step 6, performing instant high-temperature sterilization at 140 DEG C for 15 s to obtain the target drink. The oat isprocessed into the drink, nutrients of the oat can be absorbed,
digestion and absorption are facilitated, the instant
drinking function of the drink is realized, the drink is easy to carry and drink,the dietary strategy of the oat is simplified, and the drink better conforms to fast pace and high healthcare demands of
modern life.