In the current digital environment, various media are greatly integrated, and the traditional teaching is facing difficulties. Especially in the epidemic environment, the traditional classroom has been difficult to meet the needs of teaching. Therefore, this study aims to design a video teaching system for classroom teaching by using the digital media technology in the media fusion environment, so as to meet the needs of students’ digital learning in the new era. For dry teaching design, this study focuses on the analysis of video teaching in classroom teaching and adds subtitles for classroom video materials to facilitate students to learn. For the principle of media integration, this study uses the combination of digital media and various media to achieve the purpose of teaching design. The experimental results of this study demonstrate that the time of video segmentation is between 130 s and 170 s, and the overall segmentation accuracy is above 95% and up to 100%, indicating that the functional use of the system in this study is satisfactory. For the function of adding subtitles, the overall accuracy rate of the system is above 97%, and the highest rate is 100%, which fully shows that the system can provide good support in the learning process.