Abstract: The wall cavitation flow characteristics of the underwater vehicle is a typical problem in the study of cross-media impact dynamics, and it is also the focus of experimental research. The cavity flow on the surface of the water-exit vehicle will undergo dramatic morphological changes during ejection. Due to the complex changes of the flow field, it is often difficult to capture the specific process of cavity evolution. If students are allowed to operate the experiment personally and visualize the severe cavitation morphology in front of students, it will become a good experimental teaching case and strengthen students' understanding of relevant theories. In order to accurately capture the shape of the cavitation flow on the surface of the vehicle, this paper uses the underwater ejection experimental device to explore the evolution law of the cavitation shape by shooting the underwater ejection process of the vehicle with a high-speed camera. On this basis, the schlieren experiment was carried out by using high-speed camera and optical imaging schlieren to explore the fluctuation phenomenon and surface flow evolution process of the vehicle during the water exit process.