With the in-depth influence of 5G technology on film art, the postmodern culture contained in it is also becoming more and more obvious. Understanding the context of the 5G era and clarifying the origin of film postmodernism culture will help us deeply analyze the cause of the rise of postmodernism film culture, especially the important influence of the expansion of film application scenes, the innovation of the whole industry chain and the evolution of film aesthetics on the rise of postmodernism film culture. In addition, we should also think deeply about the film culture under the post-modernism of 5G era, and explore the way to stick to the benign development of film creation and film industry. To enhance our cognition and appreciation of post-modern film culture, to give play to the positive factors of post-modern film culture, and to promote the healthy and prosperous development of Chinese film production, creation and industry.