Abstract:Firstly, this paper introduces the research background, characteristics, classification and research status of Underwater Unmanned Vehicles at home and abroad. Then, it expounds the landmark achievements made in this field in China, including several AUV and ROV products, with emphasis on the technical characteristics and technical difficulties of a large-depth AUV and a deep-sea ROV. Then, the future development trend of this field is prospected. Finally, a summary of the full text is given.