The invention discloses a segmental variable repeat frequency model sampling uniformity digital processing method and a segmental variable repeat frequency model sampling uniformity digital processingdevice. The method includes steps of step S1, confirming every sampling position after uniformity sampling according to the working time and sampling rate under every sampling state; step 2, performing short-time cutting on echo data according to the sampling rate and an instant Doppler bandwidth to obtain every sub-section echo data; step S3, resampling every sub-section echo data after short-time cutting to the uniform equivalent sampling position through a special interpolation treatment; step S4, performing distance and time alignment on the data after orientation resampling. According tothe feature of the segmental variable repeat frequency signal, a signal uniformity pretreatment plan is designed, so as to transform non-uniform sampling to uniform equivalent sampling signal, thus the observing target property is acquired by means of analysis algorithm of subsequent uniform sampling signal.