Abstract: Frogman is very difficult to detect due to its small size and low noise intensity. Thereby frogman can secretly sneak into key water areas to conduct reconnaissance or damage, which poses a challenge to the safety of underwater areas. In this paper, the difficulty points of underwater frogman detection are pointed out, the technical status of antifrogman sonar equipment is introduced, the research situation of active and passive acoustic signal characteristics of underwater frogman at home and abroad is reviewed, and the key technologies for improving anti-frogman sonar equipment system are looked forward. This paper is expected to provide reference for the development of anti-frogman sonar system in our country.