The invention discloses a method for obtaining micro-motion trajectories of different scattering centers of a rotating target based on the interferometric phase. The method comprises the steps of generating radio frequency radar signals, and transmitting the radio frequency radar signals through a transmitting antenna; receiving radar echoes of multiple targets by adopting three receiving antennas, wherein one of the receiving antennas is the transmitting antenna; obtaining echo signals received by each antenna; converting the echo signals into the time-frequency domain, and extracting the instantaneous frequency of the signals by adopting a Viterbi algorithm; decomposing the echo signals by adopting an ICCD (Intrinsic Chirp Component Decomposition) algorithm according to the instantaneousfrequency; and extracting the interferometric phase between the decomposed signals, and obtaining micro-motion trajectories of different scattering centers of the rotating target. According to the invention, the echo signals are decomposed through ICCD, thereby being excellently separating the echo signals between different scattering points, and thus better extracting the interferometric phase caused by each rotary scattering point including a part where intersection exists in a time-frequency graph so as to obtain the micro-motion trajectories of different scattering centers.