Abstract: The paper systematically and comprehensively introduces the operation environments, functional requirements, structure designs, dynamic and control researches of the deep ocean mining robots at home and abroad according to different mineral resources, including the polymetallic nodules, cobalt-rich crusts and polymetallic sulfides. The achievements and shortages of the deep ocean mining robots researches in China are summarized, and the existing gaps compared with the advanced countries are pointed out. Finally, the key technologies to be urgently improved and the future development trends of the deep ocean mining robots are proposed.