This paper reviews the technical progress of power generation devices of tidal energy, tidal current energy, wave energy, ocean thermal energy and salinity gradient energy in China. The 4.1 MW Jiangxia tidal power station, 650 kW tidal current energy power station of Zhejiang University, 500 kW wave energy power station of Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences and 15 kW ocean thermal energy power station of First Institute of Oceanography, Ministry of Natural Resources are compared with the advanced marine energy equipments abroad in terms of the scale and the key technical parameters. The results show that the energy conversion efficiency of power generation is close to the international advanced level, but there are still some gaps in the installed power, sea trial time and device reliability. Then this paper suggests that the research and development of common technology of marine energy devices should be carried out at the same time of developing the key technology, so as to improve the reliability and safety of marine energy equipments. Researches on green technology and comprehensive utilization of marine energy should be carried out actively to promote the transformation of key technologies of marine energy, and to promote industrialization of marine energy equipments.

marine renewable energy  /  tidal energy  /  tidal current energy  /  wave energy  /  ocean thermal energy  /  salinity gradient energy  /  power generation device