The invention discloses an airborne CSSAR radar moving-target detection method. The main ideas of the airborne CSSAR radar moving-target detection method are that: establishing an airborne CSSAR radar signal module, and obtaining the instantaneous distance R(ta) from an SAR radar to a moving-target through calculation; acquiring an echo signal received by the CSSAR radar and demodulating the echo signal to a base-band, and obtaining a CSSAR radar echo signal s0 (tr,ta) of a two dimensional time domain; performing overlapping subblock dividing processing on the s0 (tr,ta), and dividing the s0 (tr,ta) into D subblocks; performing azimuth and range two dimensional Fourier transform respectively on the CSSAR radar echo signal, of the two dimensional time domain, respectively corresponding to the D subblocks, and obtaining the two dimensional frequency domain CSSAR radar echo signal S0 (fr,fa) corresponding to the D subblocks through calculation; performing related transform on the S0 (fr,fa), and obtaining the respective image contrast corresponding to the D subblocks through calculation; and drawing the respective image contrast curve corresponding to the D subblocks, and then obtaining the respective image contrast peak value corresponding to the D subblocks and establishing a moving-target detection rule so as to identify the respective moving-target contained in D subblocks.