. Crawling is a rhythmic locomotor behavior of animals， and its underlying mechanisms has been studied by many scholars for over a hundred years. With the continuous progress of computer integration technology， materials science， aerodynamics， micro-nano manufacturing， and artificial intelligence technology， the research on bionic crawling robots is developing towards miniaturization and intelligence. This paper provides a comprehensive review on the cutting-edge dynamic development of insect level micro crawling robots， and provides constructive suggestions for the future development of micro crawling robots based on the current development trend. First， the research background and basic concepts of micro crawling robots are introduced， and the motion mechanism and stability criteria of micro crawling robots are briefly analyzed. Second， the driving methods of micro crawling robots are analyzed and the performance of various micro crawling robots is compared. Finally， the key technologies of micro crawling robots are summarized from three aspects： Energy supply， manufacturing， and design. The problems faced in the research of micro crawling robots are discussed， and the future application prospects and development directions of micro crawling robots are proposed.