The invention discloses a high-dynamic and weak-signal block zero-padding code capture method based on DCFT. Firstly post-correlation signals are partitioned into K bits of data, then zero-padding is performed on each bit of data, and then data bit symbols are calculated on the basis of the discrete chirp Fourier transform (DCFT) so that high-dynamic GPS weak signals are captured. Compared with a conventional BASIC method, the DCFT is adopted so that signal dynamic parameters including initial frequency, chirp constant and the bit symbols are predicted under a lower signal-to-noise ratio.