The invention relates to a db6 discrete wavelet transform based wind power cluster power convergence effect time-frequency analysis method. For the problem of lacking the function that the wind powercluster power convergence effect is analyzed from the perspective of the time-frequency domain, on the basis of the characteristics and the discrete transform principle of db6 wavelets, typical peak regulation and frequency modulation time scales of a system are comprehensively considered, wind power frequency band division for power grid operation is determined, the time-frequency analysis indexis built, and then time-frequency characteristic analysis is conducted on the convergence effect of wind power in all frequency bands. Accordingly, by analyzing the wind power convergence effect time-frequency characteristics, important guiding significance on planning, safe operation and power grid dispatching of large-scale wind power cluster grid-connection is achieved.