The work aims to analyze the role image in the animated film "Deep Sea", to further understand and recognize the importance of role building in the animated film. With the animated film "Deep Sea" as an example, the design and function of the role image in the film are analyzed and discussed from the perspective of the images of leading role and supporting role in combination with the film plot. With the rapid development of China's film market, China's animated films have also made great progress. The animated film industry is in a booming stage, producing more excellent works with richer contents and different themes. Like subject, theme, story and other content elements, role is also an extremely important component in animation works. The leading role is the representative of the film, and its excellent image can be deeply rooted in the hearts of the people. Although the supporting role is not as brilliant as the leading role in the film, it also occupies an important position in the creation of the film. The role building is a crucial link in the production of animated films, which is the core of the story and the bridge between the audience and the film. Therefore, with the animated film "Deep Sea" as an example, the role building in the film is analyzed, hoping to provide some inspiration and reference for the creators of animated films and help them create more attractive and infectious role images.