The present invention relates to a sterilization method in which the nutrients of raw materials are preserved and the harmful bacteria are completely killed. The sterilization method for preserving the nutrients of the raw material of the present invention and completely killing the harmful microorganisms includes a packaging step of separately packaging the prepared formula using a sealing machine； A sterilizing device preparing step of preparing a sterilizing device which is connected to a lower part of the steam supply device and is configured to supply steam to the internal space and water is contained therein； A heating step of supplying steam at a temperature of 180 to 220 ° C to the inside of the sterilizing device using the steam supplying device to maintain the water temperature inside the sterilizing device at 85 ° C； A case is prepared, the vinyl-packaged food formula is put into the case, the case is put into the sterilization apparatus, and the case is kept in water for 20 minutes and sterilized by heating； The case is taken out from the sterilization apparatus, and then water is supplied at a temperature of 15 ° C to cool the vinyl-wrapped baby food until the vinyl surface temperature becomes 20 ° C .； And a refrigerating step of putting the cooled baby food in a refrigerator set at 2 캜 to refrigerate. According to the present invention, it is possible to minimize the nutrient destruction of the food formula by packing the finished food formula, putting it into a water tank heated by steam, sterilizing by heating, and cooling the food by removing the harmful bacteria. It is possible to prevent the infecting of harmful microorganisms in the process of sterilization and packaging in order to further increase the stability and to prevent the temperature of water from exceeding 85 ° C. in the sterilization process, It is possible to supply nutritionally balanced nutrients to infants.본 발명은 원료의 영양분은 그대로 보존하고 유해균을 완전히 사멸하는 살균 방법에 관한 것이다.본 발명의 원료의 영양분은 그대로 보
