Recirculating aquaculture is one of the main development directions of aquaculture in the future. The excessive enrichment of CO2 in the system will affect the filtration efficiency of biofilter and the growth and development of aquaculture objects. Therefore, the efficient removal of CO2 is the key technology in the whole circulating aquaculture system. In the development process of China 's circulating aquaculture industry for more than 30 years, various CO2 removal technologies have become increasingly mature. This paper focuses on the application status of industrial recirculating aquaculture system at home and abroad, introduces the source, harm and basic principle of CO2 removal in recirculating aquaculture system, summarizes the characteristics and research progress of three CO2 removal processes of gas exchange method, chemical method and ecological method, summarizes and compares the advantages of various removal technologies. In view of the problems of single method, large space occupied by main facilities and high cost of CO2 removal, this paper puts forward some future development countermeasures, such as the combination of various removal processes, intensive operation of equipment system, optimization of removal process and intelligent equipment. The purpose of this study is to provide reference for the optimization of CO2 efficient removal technology and the development of special equipment for industrial recirculating aquaculture in the future.