The automatic frequency correction method and device includes two stages of coarse frequency correction and fine frequency correction. The coarse frequency correction includes the steps of signal extraction, sliding correlation and phase deviation estimation, multiple frequency merging, creating time delay envelope, route selection, multipath merging, frequency control, etc. and corresponding modules. The fine frequency correction includes the steps of signal extraction, channel estimation and route search, route merging, frequency deviation estimation, SINR estimation, Kalman gain factor calculation, the first order loop filtering, frequency control, etc. and corresponding modules. The present invention makes it possible for the receiver to realize frequency sync in time division system fast accurately in harsh mobile communication environment.