On the basis of analyzing the current development of children's snack food and its packaging design, children’s psychological cognitive characteristics during growth were discussed, and the important meanings for innovating packaging design of their snack food according to those characteristics were also put forward. Combined with the information from relevant literature, it was pointed out that the multi-dimensional interesting expression of children's leisure food packaging design should adhere to the basic principles of “safety first, interest and safety considered, and ‘people-oriented’ personalization”. The interesting expression of children's leisure food packaging should be realized through the multi-dimensional expression of color, image, shape and structure. Finally, the future development direction of children's leisure food packaging design was summarized.