Booster lower extremity exoskeleton is a wearable intelligent mechanical device that can greatly enhance the wearers physical strength or help users with walking disorders to walk.They can be used in military,disaster relief,medical treatment,physical work and other aspects,and has a broad development prospects.Due to its unique advantages,the technique of lower extremity exoskeleton has developed rapidly in recent years.The current research status at home and abroad was reviewed from two aspects:heavy load and rehabilitative lower extremity exoskeletons.The key technologies that needed to be solved in the research and development of exoskeleton were analyzed in detail,and the development direction of exoskeleton was prospected.