The invention discloses a revolving speed curve estimation method based on the combination of EEMD-HHT (Ensemble Empirical Mode Decomposition- Hilbert-Huang Transform) and time-frequency reassignment.The method comprises the following steps that: A: using EEMD to decompose a vibration signal; B: combining a correlation coefficient with an energy spectrum, and extracting an IMF (Intrinsic Mode Function) corresponding to a reference axis; C: carrying out Hilbert transform on an extracted IMF component to obtain the instantaneous frequency value of each point of the extracted IMF component; D: intercepting the respective data of certain length of the front end and the rear end of the extracted IMF, and carrying out time-frequency reassignment transform to obtain two time-frequency matrixes;E: carrying out ridge line extraction with a restricted search condition on the time-frequency matrixes to obtain the ridge lines of the front end and the rear end; F: carrying out fitting on the ridge lines to obtain the instantaneous frequency value of each point of the intercepted data; G: utilizing the instantaneous frequency value of each point of the intercepted data to replace a value, which is obtained by the Hilbert transform, of a corresponding point, and forming a new frequency array; and H: carrying out least square fitting on the frequency array to obtain a smooth revolving speedcurve. By use of the method, the EEMD-HHT and the time-frequency reassignment method are combined, the revolving speed curve is effectively estimated, and the method exhibits a realistic engineering meaning.