The invention discloses a method and device for suppressing resonance of a doubly-fed wind power generator system. The method comprises the steps of judging whether electromagnetic vibration of a stator and a rotor of a power generator is resonant with mechanical vibration of the power generator or not according to a rotational speed of the doubly-fed wind power generator system; generating a torque signal corresponding to a resonant frequency during resonance when the electromagnetic vibration of the stator and the rotor of the power generator is resonant with the mechanical vibration of the power generator; and controlling the power generator to generate electromagnetic vibration corresponding to the torque signal to offset the mechanical vibration of the power generator. By the method, no arbitrary hardware is needed to be added, the hanging workload of the power generator is not needed to be increased, the vibration of the power generator can be effectively eliminated, the problem of mechanical vibration of the doubly-fed power generator system and electromagnetic resonance of the stator core and the rotor core is solved, and the labor and material cost is greatly reduced.