Abstract: Provided are a method, a device and electronic equipment for detecting a stability of a generator set in a power system. The method includes following steps: determining a target matrix by using Liapunov's direct method based on a state space matrix corresponding to power management unit (PMU) data; obtaining a state deviation corresponding to the PMU data and an oscillation curve corresponding to the state deviation in a case of determining the power system being in a stable state according to the target matrix; determining extreme point values corresponding to the oscillation curve at each oscillation; and evaluating a working state of the generator set in the power system according to the extreme point values.