The application research of short-circuit test trigger device and method of high-voltage overhead line based on autonomous route flight technology of UAV is an innovative design of short-circuit test trigger device of high-voltage overhead line based on autonomous route flight technology of UAV. This device not only has high-precision positioning and autonomous flight capabilities, but also can work stably in complex environments, greatly improving the accuracy and safety of short-circuit tests. By setting up the experimental platform, we verify the effectiveness of the device in practical application, it accurately triggers the short circuit test, and provides a strong guarantee for the safe operation of power lines. Looking forward to the future, this device uses multi-rotor UAV to make test trigger device, which solves the problem that traditional ejection method is difficult to trigger accurately. At the same time, the key parameters and operation methods of the trigger device are determined to make up for the blank of the short-circuit test trigger quantitative control, and contribute to the intelligent and automated development of the power industry.