The invention relates to a doubly-fed wind power generator stator current diagnosis method for an impeller imbalance fault. The method concretely comprises the steps that doubly-fed generator stator single-phase current is collected, and the fundamental frequency of the stator single-phase current is extracted by utilizing FFT analysis; the fault characteristic component of the stator single-phase current under the impeller imbalance fault is calculated by utilizing the obtained fundamental frequency; an impeller rotation speed signal of a wind generation set is collected, and the characteristic frequency of the impeller imbalance fault of the stator current is calculated; spectral analysis is performed on the obtained fault characteristic component of the stator phase current by utilizing FFT, according to the fault characteristic frequency at this time, the value of amplitude at the frequency is extracted, and under the same wind speed condition, characteristic frequency amplitude values of the wind generation set under normal circumstances are compared to judge the severity of the fault. According to the method, the problem that based on an existing direct fault diagnosis method for the stator current characteristic quantity of a wind power generator, the extracted fault characteristic quantity is not obvious is effectively solved. Accordingly, the method is a fault diagnosis method capable of effectively improving the safety and reliability of blades.