The invention provides a motor resonance noise processing method and device. The motor resonance noise processing method includes the following steps that: the current waveform of a motor is detected;the current frequency peak value of the motor is determined according to the current waveform; whether the current frequency peak value is greater than a first preset wave peak value is judged; and if the current frequency peak value is greater than the first preset wave peak value, carrier frequency signals are injected to the voltage input end of the motor, so that the current frequency peak value can be reduced, and therefore, the resonance noises of the motor can be decreased. According to the motor resonance noise processing method and device provided by the technical schemes of the invention, the current waveform of the motor is smoothed, and therefore, the whole unit sound quality of the motor can be effectively improved, the target wave peak value of the carrier frequency signalsis accurately determined, and the current frequency peak value obtained after the carrier frequency signals are injected can satisfy requirements.