Abstract: At present,the discrete wavelet transform has been practically applied in the lightning strike location of transmission lines based on the OPGW polarization state abrupt information. The accuracy of the polarization state abrupt signal processing algorithm based on wavelet transform can also be improved.Aiming at this problem,a method of using continuous wavelet transform and wavelet joint denoising for the polarization waveform is proposed. The method uses joint denoising with threshold and wavelet decom-position reconstruction,and selects the appropriate scale factor from the time-frequency signal after continuous wavelet transform by least squares method,and then obtains the polarization state mutation signal in the time-frequency diagram of the scale factor. Corresponding to the time information,the position of the lightning strike point is finally calculated. The simulation results prove the accuracy of this method,and the lightning strike positioning error can be controlled within the range of 20 meters.