The invention discloses an island micro power grid harmonic wave power distribution method based on harmonic wave impedance control. According to the method, firstly, the drooping relationship between DG equivalent harmonic wave impedance and DG residual capacity is established, namely the ZDGk_h_eq-SDGk_remaining drooping relationship, and difference of equivalent harmonic wave impedance of each DG is carried out according to residual capacity of each DG. The ZDGk_h_eq-SDGk_remaining drooping relationship is combined with a harmonic wave impedance control method controlling an h-order three phase harmonic wave voltage actually outputted by an inverter through detecting an h-order three phase harmonic wave current actually outputted by the inverter of the DG, actual equivalent harmonic wave impedance of the DG is made to satisfy the ZDGk_h_eq-SDGk_remaining drooping relationship, and harmonic wave power is distributed according to the residual capacity of the DG. The method is advantaged in that the control algorithm is more concise, computation is smaller, and designed DG equivalent harmonic wave impedance is more reasonable.