The invention belongs to the field of radar signal and data processing, and provides a high-dynamic deviation online estimation method based on cross-fuzzy interval judgment for the high-dynamic deviation real-time estimation problem under the distance and velocity measurement ambiguity condition. In the study of the problem, the high-dynamic deviation online estimation method comprises the steps of: firstly, utilizing a distance differential method to obtain target radial velocity estimations at different moments; secondly, performing mutation judgment on radial velocities at adjacent moments, finding out cross-fuzzy interval radial velocity estimations, and making compensation for the radial velocity estimations; thirdly, performing median filtering processing on the plurality of compensated radial velocity estimations, so as to obtain velocity ambiguity-resolving measurement; and finally, performing online estimation on high-dynamic distance-delay deviation by utilizing velocity ambiguity-resolving measurement. The high-dynamic deviation online estimation method can effectively solve the high-dynamic deviation estimation problem under the distance and velocity measurement ambiguity condition, and has good effect when a target moves cross the fuzzy interval.