The aero-engine nozzle is a key component that affects combustion performance. It has many components and complex structure, especially the difficulty of the processing of nozzle internal flow channel, resulting in long manufacturing cycle and high cost. However, the nozzle as a non-main load-bearing part is very suitable for laser selective melting manufacturing (SLM), which is due to the high precision of processing, strong free-form ability and high density of material of laser selection melting. In this paper, based on the technical advantages of SLM, the shell of the nozzle is integrally designed, and the mechanical analysis and topological optimization were analyzed. The molding part was printed by SLM and about 13.5% of its weight has been reduced. The printing error is less than 0.2mm, meeting the margin requirement of local finishing, and the mechanical properties of the furnace specimen reach the level of traditional casting and forging. SLM simplifies the processing of the nozzle, shortens the manufacturing cycle, and has high precision of flow path forming, which achieves the goal of reducing weight and improving performance.