This paper introduces the basic parameters, configuration, function and operation mode of deep?sea AUV products at home and abroad, discusses the development status and development trend of deep?sea AUV, and focuses on the application of deep?sea AUV in deep?sea detection, target recognition, deep?sea anti system and other fields. On this basis, the key technologies of deep?sea AUV in energy, control, navigation and traffic are deeply analyzed, and the current status and future development trend of key technologies are clarified. According to the development trend at home and abroad, it is pointed out that after 3 stages of development, deep?sea AUV tends to be convenient, lightweight, compact, intelligent, and networked.