Deep-sea cage is a new type of aquaculture model, which has the advantages of advanced technology, environmental friendliness and high quality of marketable fish. Therefore, it has a great significance to the promotion of green development strategy of aquaculture. Based on a brief introduction to the development of common cages, offshore cages, as well as deep-sea cages, this article provides a detailed overview of the present situation and research progress of deep-sea cages before and after 2017 in China, and prospects for future development directions. Before 2017, deep-sea cages were in its infancy. Nearly 10 types of deep-sea cages with simple structures, such as assembly type metal cages facilities in deep-sea lagoon, were developed and mainly distributed in Hainan, Guangdong and Guangxi, which provided technical reserves for the subsequent development of the deep-sea cage. Since 2017, deep-sea cages have entered a stage of rapid development. More than 10 types of deep-sea cages with complex structures have been developed, including the Deep Blue No. 1 full-submersible deep-sea farm. They ushered in the modernization of Chinese deep-sea cages. So far, the research on the definition of deep-sea cages, cage materials, and its supporting patents have been reviewed. As a new type of aquaculture model, deep-sea cages have obvious comprehensive advantages and will be a useful supplement to Chinese aquaculture industry in the future. According to the requirements of the green development strategy of the aquaculture industry, the deep-sea cages will be developed in the direction of offshore, large-scale, intelligent, and intensified in the future to expand the aquaculture area, to improve production efficiency, increase technological content, reduce culture costs, and upgrade the industry level. Although Chinese deep-sea cage aquaculture industry has made great progress, there is still a huge gap compared with foreign advanced technology. The related work has a long way to go, which is worth our efforts to study deeply.