The present disclosure relates to a method for sterilizing sealed and packaged food using atmospheric-pressure plasma and sealed and packaged food prepared thereby. The method includes: seal packaging food by injecting a gas containing 10 vol % or more of oxygen, carbon dioxide or a mixture gas thereof based on the total gas into a plastic packaging material containing the food or vacuum packing food in a plastic packaging material； and treating the packaged food with direct atmospheric-pressure plasma, thereby allowing food which cannot be heat-treated, such as fresh food, to be sterilized and allowing food to be sterilized even when polyethylene, polypropylene, nylon or polyethylene terephthalate through which plasma cannot pass is used as a food packaging material.
