The invention discloses a distortion power metering method, which comprises the following steps: 1) obtaining fundamental wave apparent power S1, full wave voltage V and fundamental wave voltage V1, calculating voltage distortion rate THDV, and furthermore, calculating irresponsible apparent power S'; and 2) calculating distortion power DH according to the full wave apparent power S and the irresponsible apparent power S'. The method is based on IEEE 1459-2010 power definition, and application thereof can accurately quantify harmonic pollution generated by load, thereby improving fairness of electric power measurement.