The invention discloses a method for acquiring a pseudo code of a GNSS signal, which is mainly suitable for acquiring the code of a conventional ranging code signal in a GNSS receiver. The method comprehensive uses a Winograd Fourier transform algorithm, a prime factor algorithm PFA and a Cooley-Tukey FFT algorithm to perform discrete Fourier transform DFT and inverse discrete Fourier transform IDFT, thereby simplifying time domain-related algorithms by using a DFT and IDFT group calculation and completing the related acquisition of the pseudo code of the GNSS signal. The method of the invention belongs to a code parallel frequency domain acquisition method which has fast acquisition and is advantageous over the conventional time-domain acquisition method in software and hardware resourceconsumption; and meanwhile, due to the characteristic of the combination of the WFTA, PFA and Cooley-Tukey FFT algorithms, the method can perform the DFT and IDFT calculation of all sampling points ofthe sequence of the pseudo code and retains the related characteristics of the sequence of the pseudo code, thereby achieving an acquisition performance better than that of a classic double sampling-based fast Fourier transform FFT acquisition method.