Wireless covert communication is the technology of hiding messages in wireless communication data frames and signals for covert transmission,which belongs to the cross-field of wireless communication and information hiding technology.This paper analyzes the system model and main ability factors of wireless covert communication,summarizes the theory of noise-type covert channel capacity and the research progress of wireless covert communication technology in link layer,coding layer,modulation layer and signal layer,and gives the problems that need further study.