This article introduces the working environment and manufacturing characteristics of liquid rocket engine in the aerospace field， and analyzes the principle of additive manufacturing technology and its advantages in corresponding manufacturing field.It also summarizes the latest situation of domestic and foreign aerospace additive manufacturing technology application. Combined the engineering application examples of liquid rocket engine， the application development of additive manufacturing engineering has undergone a systematic analysis of the four stages of engineering applications refer to replacing traditional processes，integrated manufacturing，lightweight manufacturing and systematic integration design. And points out the existing solutions and problems in the process of engineering application advancement of liquid power additive manufacturing technology.It puts forward corresponding development suggestions for the promotion of additive manufacturing industrialization finally.