The invention discloses a time-frequency curve extraction method for precession targets based on frequency domain entropy, and mainly solves the large calculated quantity and low efficiency of spectrum correlation calculation in the prior art. The method comprises steps of: 1, subjecting the envelope of a radar echo signal to FFT to obtain a time-frequency signal; 2, performing constant false alarm on the time-frequency signal at each moment by a constant false alarm algorithm to obtain a series of frequency points at each moment; 3, performing agglutination on the series of frequency points obtained at each moment to obtain one or two time frequency points at each moment; and 4, matching the one or two time frequency points by using the frequency domain entropy to obtain a curve, and automatically forming another curve by using the remaining points. The method reduces the calculation amount, improves the correlation efficiency, improves the matching success rate, and can be used for target recognition.