Frogman is very difficult to detect due to its small size and low noise intensity，and can sneak into key areas secretly such as docks，seaports，offshore exploration platforms，ship anchoring areas，islands and so on to conduct reconnaissance or damage，posing great challenge to the safety of underwater areas. In this paper，the difficulty of underwater frogman detection is pointed out，the technical development of anti-frogman sonar equipment systems at home and abroad is introduced，and the research progress of active and passive acoustic characteristics of underwater frogman targets are analyzed. In conclusion，the development of the anti-frogman weapon system is reviewed，the current technical characteristics of the anti-frogman sonar system are summarized， and the development trend of the anti-frogman sonar system is predicted，providing reference for the domestic development of anti-frogman sonar system.