The development of short videos and big movies requires high-quality visual design. In the context of digital technology development, computer multimedia technology has begun to emerge in the field of video processing, promoting innovative development in China’s industry. The post production of film and television works requires the use of computer multimedia technology to expand the creative space and improve the artistic expression effect of film and television works. This article elaborates on the unique role of computer multimedia technology in the field of film and television post production, and then analyzes the various stages of film and television post production. The focus is on using computer artificial intelligence techniques to improve the quality and efficiency of video editing in the video editing stage. Then, in the color rendering stage of some black and white video resources, computer technology is automatically processed, Therefore, computer multimedia technology can play an advantageous role in film and television post production and should be promoted and applied.