The invention provides a suppression method of harmonic wave frequency division in an inverter. The method includes acquiring output voltage v0 and current i of the inverter with a fundamental wave robust droopy controller, and acquiring a fundamental wave voltage modulating signal vrl by performing fundamental wave robust droopy control to the output voltage v0 and the current i; acquiring the output voltage v0 and the current i of the inverter with a harmonic wave robust droopy controller, and acquiring a harmonic wave voltage modulating signal vrh by performing harmonic wave robust droopy control to the output voltage v0 and the current i; summing the fundamental wave voltage modulating signal vr1 and the harmonic wave voltage modulating signal vrh to acquiring a voltage modulating signal vr with voltage modulating signal superposition units; acquiring the output current i of the inverter with inverter output impedance control units, and processing the difference between the product of the current i and proportionality coefficient Ki and the voltage modulating signal vr as a PWM (pulse-width modulation) wave control signal u to be input to a PWM signal generator; receiving the output signals from the PWM signal generator with a driving circuit, and driving the inverter to turn on or shut off. With the technical scheme about the suppression method of harmonic wave frequency division in the inverter, harmonic wave problems of output voltage of the inverter are effectively solved, and the wave quality of the output voltage of the inverter is improved.