Abstract: Infrared thermography is a non-destructive testing technology that can be applied to determine the superficial temperature of objects. In this article, the machining process of mock explosive part is online monitored and the influence rules of temperature rise are obtained including the cutting velocity, cutting depth and void defect. The results indicate that infrared thermography can be used to monitor the temperature distribution of explosive parts during machining process and the change rule of temperature can be analyzed for the reference of safety of ammunition machining.