Aluminum matrix composites prepared by laser powder bed fusion technology show profound research prospects in aerospace, military, transportation and other fields. The effects of the nano-reinforcement types, the methods of adding nano-reinforcements into aluminum alloys and the nano-reinforcement content on the printability, structure and mechanical properties of aluminum alloys are the main focus of researchers. This paper mainly summarized and analysed the effects of TiB 2 , graphene and TiC nano-reinforcements on the grain morphology, grain size, relative density, printability, and mechanical properties of aluminum alloys prepared by laser powder bed fusion technology while providing a comparison of the effects of different nano-reinforcements on the mechanical properties of the as-built aluminum alloys. Analysis shows that the nano-reinforcements represented by TiB 2 can improve the strength and plasticity of the as-built aluminum alloys, resulting in a good comprehensive mechanical performance effect. Finally, this paper proposes further development trends for this research field in the future.