The invention discloses a sub-synchronous and super-synchronous harmonic parameter processing method based on PMU implementation. Current signals containing sub-synchronous and super-synchronous harmonic parameters in A/D acquisition are resampled, can be used for analyzing sub-synchronous harmonic parameters and can be also used for analyzing super-synchronous harmonic parameters, a frequency spectrum of an FFT is corrected by using a Grandke frequency spectrum correction method, a picket fence effect and a frequency spectrum leakage phenomenon in frequency spectrum analysis of the FFT are overcome, the identification precision of oscillating component parameters is greatly improved, the software and hardware expenditures on a WAMS master station side are reduced to some degree, reliable raw data and data support are provided for functions such as power grid wide-area monitoring, automatic substation measurement and control, stability control and self-adaptive relay protection of a whole system, and the sub-synchronous and super-synchronous harmonic parameter processing method has a good application prospect.