With the growth of the global population, the children's food market is expanding, and the design of children's food packaging is increasingly being paid attention to. As an intuitive and vivid visual language, illustration plays a vital role in children's food packaging. It can not only attract children's attention and improve the appeal of the product but also increase the interest in the package through the story context and game elements, thereby enhancing children's awareness and loyalty to the brand. Therefore, the application method and effect of illustration in children's food packaging have become a problem worth studying. In-depth understanding of children's preferences and cognitive characteristics of illustration in different age groups is helpful to design food packaging that better meets children's needs. With the continuous expansion of the modern children's consumer market, illustration design, as an indispensable element in children's food packaging, has a unique visual appeal and emotional connection ability to attract children consumers. This paper will study the method of integrating illustration design into children's food packaging and discuss the three parts of hand-drawn design, vector drawing, and digital synthesis technology in detail. This paper aims to explore the application methods and effects of illustration in children's food packaging, identify the research gaps in this field by summarizing the current research progress, and put forward the research theme and specific problems of this paper. Then, the methods adopted in this study will be introduced in detail, and their significance will be expounded. Finally, future development will be predicted, and suggestions for possible problems will be put forward.