The invention discloses a time scale unified dynamic reactive power generating device response time detecting method. The time scale unified dynamic reactive power generating device response time detecting method solves the problem that detection on the dynamic reactive power generating device response time is inaccurate in the prior art. According to the time scale unified dynamic reactive power generating device response time detecting method, a high voltage side bus, a low voltage side bus, the dynamic reactive power generating device and a waveform recorder are included, a secondary side phase A of a first current collection circuit current transformer (11) is electrically connected to a second current waveform input terminal of the waveform recorder (4), and the sampling of response current waveforms and response voltage waveforms is completed by operating a breaker (10). A response time calculation model is established in a computer by using a discrete data calculation effective value tool, calculation time is set as 800 milliseconds, a voltage effective value curve (15) and a current effective value curve (16) of a smooth response process are generated, and accurate dynamic reactive power generating device response time is obtained. The time scale unified dynamic reactive power generating device response time detecting method can calculate the dynamic reactive power generating device response time accurately, and is especially suitable for field service in a power grid.