The invention relates to a projectile nutation angle extraction method based on radar Doppler data. The method is characterized by comprising the following specific steps of arranging a radar tail chasing distributed station at the side rear part of an artillery or a rocket artillery, carrying out tracking measurement on a flying artillery shell or a rocket artillery shell, and estimating the radial velocity of a centroid; calculating micro motion speeds; extracting a precession period; resolving a velocity vector; calculating the nutation angle of a projectile. According to the method, the difficult problem in nutation angle measurement of the flying projectile under the conditions of long distance is solved effectively, and the motion of the rotating projectile in the air includes micro motions relative to the centroid, such as precession and nutation, besides centroid motion; radar signals are subjected to periodic modulation, namely micro-Doppler effect, by the micro motions. Internal data of the radial velocity obtained through radar measurement contain information on the micro motions, such as nutation, a nutation angle curve of the projectile can be obtained through processing the internal data, and the nutation angle of the projectile is obtained through an established micro-motion velocity equation.