Abstract: In order to meet the needs of power transmission, signal transmission and audio/video transmission between underwater robot and surface control system, a kind of marine umbilical cable for underwater robot was introduced.Through structural design, material selection, manufacturing process, calculation and analysis, key parameter design and test method determination, mechanical properties, environmental properties and electrical properties of the umbilical cable were measured.Results showed that measured values of the umbilical cable were consistent with design requirements, having the characteristics of strong tensile resistance, seawater corrosion resistance, salt spray resistance and biological invasion resistance, which could meet the requirements of compatibility between power cables and audio/video cables, and also have good flexibility.