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In the case of serious channel mismatch of wideband digital array radar, the band-partition method has a better equalization effect than the inverse Fourier transform method. However, the reconstruction error is significant, and the hardware resources required are excessive when the decomposition is incomplete. Aiming at the above problems, an extended bandwidth non-uniform extraction equalization algorithm is proposed in this paper. Firstly, the number of sub-bands to be divided is set, and sub-bands that do not participate in equalization are merged according to the position of stopband cutoff frequency. Then, non-uniform decimation is performed according to the frequency characteristics of the sub-bands to be equalized. Finally, the operations of equalization, interpolation, and merging are implemented for the sub-bands to be equalized after extraction.? The simulation results show that the amplitude improvement factor and phase improvement factor of the proposed method are 5.39 dB and 7.48 dB higher than that of the band-partition method when the number of equalized sub-bands and reconstruction error are equal, while reducing computational complexity and hardware resource usage.