The invention relates to a frequency coherence processing method for time-lapse seismic mutual constraint. The frequency coherence processing method comprises the following steps: (1) sorting of two period data of time-lapse seismic data sorting; (2) autocorrelation calculation; (3) cross correlation calculation of autocorrelation results; (4) calculation filtering operator; (5) using each filtering operator to process the two seismic traces of the common center reflection point or common reflection point so as to achieve the coherence frequency of two seismic data. In the process of the frequency coherence processing method, the seismic data collected at different times in the same block are processed so that the influence of various factors is eliminated, the frequencies of the two data are reasonably identical but different, the frequency difference of seismic response in different periods determined only by the change of oil and gas reservoir is ensured; the frequency coherence processing of the space change is realized, thus the frequency consistency processing precision is improved, and then the monitoring ability of time-lapse seismic to the reservoir change is improved.