Amphibious vehicles are a specific type of equipment that can travel both on land and in water. They have a wide application prospect in both military and civil fields. Recently,with the substantial development of the intelligent technology and unmanned combat equipment,unmanned amphibious vehicles have become a significantly important new field of competition around the world. In this paper,the research progress of unmanned amphibious platforms and their key technologies in recent years are reviewed and analyzed. According to the propulsion mode, amphibious unmanned platforms are divided into three categories,which are wheel/crawler-type,combined type and bionic type. According to this classification,the typical unmanned amphibious vehicle prototypes and their parameters are summarized. The key technologies for the development of unmanned amphibious platforms in the future are sorted out. This paper provides reference for the research of unmanned amphibious vehicles.