Abstract: In response to the need for in-service monitoring of titanium alloy damages in high-temperature environments, a real-time dynamic monitoring technology using acoustic emission (AE) was proposed. In this paper, the acoustic emission monitoring test of tensile damage mechanics of TA15 titanium alloy at high temperature was carried out by simulating the high-temperature environment in the real casing. Firstly, titanium alloy was determined as the material for waveguide rods. Then, the titanium alloy specimens welded with waveguide rods were subjected to high-temperature tensile tests at different tensile rates. Experiments showed that the mechanical properties exhibited regular changes at different temperatures. Acoustic emission technology can successfully monitor and characterize the damage evolution of titanium alloys, and counting can clearly reflect the different mechanical stages of tensile experiments at high temperatures.