Abstract: Focusing on the current mainstream key technologies of green hydrogen production,this paper reviews the latest research progress of green hydrogen technologies at home and abroad,and focuses on the hydrogen production principles,technical difficulties and improvement methods of electrolytic water hydrogen production technology（alkaline electrolytic water method,proton exchange membrane electrolysis water method,solid oxide electrolysis water method）,solar decomposition water hydrogen production technology（photocatalytic method,photo-thermal decomposition method,photoelectric chemical method）and biomass hydrogen production technology（thermochemical conversion method,microbial method）. In addition,the characteristics of various‘green hydrogen’technologies are discussed and compared. Finally,the application prospects and development directions of green hydrogen production technologies in the future are analyzed.