Abstract: Ferrite/austenite duplex stainless steel has a combination of good ductility and toughness, excellent corrosion resistance and high strength due to its unique microstructure characteristics, and has a wide application prospect in many fields such as marine engineering, petrochemical engineering. High-energy-density welding technique has attracted attention from scholars in recent years because of its narrow heat affected zone, low deformation level, low residual stress, high welding speed and high productivity. The research progress of high-energy-density welding is introduced from two aspects of welding method and process, and then the microstructure and properties of duplex stainless steel with high-energy-density welding and post-weld heat treatment are reviewed. Finally, the problems existing in the current research of high-energy-density welding of duplex stainless steel are pointed out and the future research direction is given.