Picture language is a kind of narrative method that uses various factors such as light effect, tone and colour, and stimulates the effects of sight and hearing. It mainly has functions such as narrative background, message transmission, explanation of events and sublimation. It can smoothly connect two pictures, and transform the composition of the picture, the keynote, etc., to achieve the purpose of adjusting the rhythm of the work. I think there are two main forms of expression. The first is the silent picture language. The silent picture language focuses on the light effect, composition and other parts. It is mainly based on quiet pictures, but it can change the color of the picture to achieve the effect of impacting people’s vision. In the documentary filming, more silent picture language should be added to give the audience room to think and imagine, making the silent picture language a carrier for conveying emotions. The other one is a sound picture. Many hidden backgrounds and stories of the documentary need to be conveyed through the sound picture language. This descriptive and expressive picture language can accurately express the thoughts of the work itself. From the perspective of the audience’s ability to accept, the appropriate sound picture language can remind people to pay attention. To the focus of the documentary, the narratives of many documentaries are relatively dull and lack of ups and downs. When adding a sound picture language, attention should be paid to highlighting the central idea of ​​the documentary and guiding the audience to read the works in a more appropriate language.

Many documentaries have professional commentators who explain the background, time, etc. of the event outside the screen, but it is easy for people to jump out of the picture. If the screen language is used instead of the commentator, let the audience take the initiative to understand the information hidden behind the documentary. The plot is presented in the form of a picture, which not only paves the way for the subsequent development of the work, but also increases the integrity of the work. In the process of preparing the documentary, I will select some living environment pictures, highlight the details of the picture, and better connect the whole work. However, it is necessary to pay attention to the coordination and consistency of the picture language. Whether the transition of the food documentary is stable depends on the processing of the screen language and enhances the coordination between the images in order to fully display the ideas of the works.