The invention discloses a high-voltage circuit breaker operating characteristic measuring device based on high-speed imaging and an application method thereof. The device comprises an adjustable support rod, a high-speed imager and a measurement aiding scale. The high-speed imager is fixed on the adjustable support. The measurement aiding scale is set on a mechanical moving part of a measured high-voltage circuit breaker. The high-speed imager is arranged at the outer side of the measured high-voltage circuit breaker and a lens is aligned with the measurement aiding scale. The application method includes the steps of obtaining switch-on and switch-off speed curves based on the high-voltage circuit breaker operating characteristic measuring device, and extracting operating characteristic data based on the switch-on and switch-off speed curves to evaluate the state of the measured high-voltage circuit breaker. According to the device and the application method, the non-contact accurate measurement of the operating characteristics of the high-voltage circuit breaker and the evaluation of the state of the measured high-voltage circuit breaker can be achieved, the implementation is simple and rapid, and the detection accuracy is high.