The invention provides a method and device for correcting spin echoes of while-drilling nuclear magnetic resonance. The method comprises the steps that in the process of logging an actual stratum through a while-drilling nuclear magnetic resonance logging instrument, a spin echo string output by the while-drilling nuclear magnetic resonance logging instrument and a movement state of the while-drilling nuclear magnetic resonance logging instrument are obtained; a spin echo string correcting curve is determined according to the movement state of the while-drilling nuclear magnetic resonance logging instrument and the corresponding relationship between the predetermined movement state and the spin echo string correcting curve; the spin echo string is corrected according to the spin echo string correcting curve; and the corrected spin echo string is subjected to inversion so as to obtain a T2 spectrum. Through the method, more precise stratum spin echo string signals can be obtained, and thus the T2 spectrum obtained by inversion can reflect the more realistic physical property of the stratum.