Abstract: Space manufacturing technology has important application value in the field of deep space exploration, and it is an advanced technology developed by various aerospace powers. At present, the space manufacturing of non-metallic materials has been realized. However, there are still many problems in the space manufacturing of metal materials, such as the complex control of material forming process and the limitation of load energy consumption. How to choose the optimal technical route, process parameters, and how to design microgravity experiments have become the key challenges to solve the space manufacturing of metal materials. This paper introduces the current metal additive manufacturing experiments and research carried out in the microgravity environment, and analyzes the difficulties and difficulties faced by metal material microgravity additive manufacturing. This paper focuses on the advanced manufacturing technology which is feasible and promising for space application, and discusses the future development direction from three aspects : metal material system research, key technology breakthrough and engineering application prospect, in order to provide reference for the development of metal material space manufacturing technology.