Joker is a film adaptation of the DC Comics super-villain The Joker, which focuses on the Joker's origin story. The film externalizes the spiritual world of the protagonist Arthur, showing the evils and madness of Gotham City through his perspective, and in the process, Arthur is gradually destroyed and begins his criminal career. The film is a film that brings to life the spiritual world of man through audio-visualization and is full of criticism and reflection on the morality of society. Taking the film Joker as the object of study, this paper attempts to investigate the audiovisual language and social impact in Joker, and mainly by describing and examines the typical symbolic representations and camera use in the film, it analyzes how the film presents the mental world of the character, and on this basis, it explores the film's feedback on the real world. According to the research results, the symbolic representation in scene of the film include colour, music and dance, composition of Shooting. The reflection and revelation of the real society based on the depiction of extreme society in the film include"Joker is not as anti-social and inflammatory as the media make them out to be", "madness and indulgence under absolute freedom" and "film is above reality but not reality".