The work aims to focus on the application and role of the picture language in the audio-visual language of "Deep Sea". The animated film "Deep Sea" is taken as an example and appreciated from three aspects: composition, light and shadow, and color. Combined with the specific pictures in the film, the relationship between picture background and plot, role building, core idea and national culture is explored. Picture language plays an important role in film production. For the whole film, the picture, like the subtle parts in the running machine, plays a vital role. The development of modern production technology has created more possibilities for the production and innovation of film pictures, and new technologies, new methods and new models have made the production of animated films more scientific and complete. In addition, in today's era when animated films of China are rising, how to stand out from numerous foreign films not only depends on advanced technology, but also needs to keep national characteristics of China so as to produce excellent good animated films with real Chinese characteristic culture.