Marine high-altitude spraying robot is a kind of robot developed by the spraying robot to cope with the high-altitude operation of the ship, which has a complex structure and control system. As an important part of ship manufacturing, its spraying technology not only plays a beautiful role, but also plays a role in anti-corrosion and protection, and has increasingly become an important part of ship development. In order to further understand the status quo and future development direction of Marine high-altitude spraying robot technology, the key technologies of Marine high-altitude spraying robot were studied in this study, and the four key technologies of high-altitude spraying robot were analyzed from the structural design, driving technology, trajectory planning and spraying technology, and the future development direction of the key technologies of Marine high-altitude spraying robot was prospected according to the analysis. This study provides a reference for the development of key technologies of high-altitude spraying robots for ships, so as to promote the development of intelligent and green spraying technology.