The environment of wrecks and sunken objects in the sea is ever-changing, and the salvage methods are varied. Because of its unique performance and advantages, air bag has shown great potential and value in wrecks salvage and water transportation. Air bags have always been used as buoyancy AIDS in the field of salvage, usually tied to the two sides of the wreck or placed in the wreck cabin, and then combined with internal buoyancy or other large machinery to complete salvage. In some complex narrow waters, when large machinery cannot play a role, air bag buoyancy has become the best choice. This paper introduces the development and application scenarios of air bag salvage technology, summarizes the basic principle and technical characteristics of air bag salvage, and summarizes the key technologies of air bag salvage through the research of the construction technology of air bag salvage, and discusses the limitations and prospects of its application.