Based on the theory of visual cognition in psychology and starting with visual factors such as fonts, color, image and style modeling, distinctive identification of visual language in the packaging design of products is studied and analyzed. In the packaging design of products, product differentiation can be realized through fonts to influence customers in their buying decisions. The distance from customers to goods shelf affects the width of vision and font height is in proportion to the identification distance. The different combination of font colors and background colors can lead to different degrees of identification, and meanwhile can result in different feelings in customers. The graphic design is subject to packaging structure and must be effectively combined with it in order to promote easy identification by choosing objects capable of arousing common and shared human feelings. The style design should show not only the functional effect in its physical property but also the visual effect in its artistry.