The invention discloses a method and a system for correcting residual deviation of sampling frequency in OFDM systems, which belongs to the OFDM technical field in the field of wireless communication. The method comprises the following steps: removing modulation information carried by currently received OFDM symbols in each frequency domain at a receiving end; selecting a plurality of frequency points from the OFDM symbols of which the modulation information is removed and calculating phase curves of the selected frequency points and the slope of the phase curves; correcting a channel estimation value according to the slope of the phase curves; and utilizing the corrected channel estimation value to equalize a next received OFDM symbol. The invention has the advantages of avoiding the bit-error performance drop of the systems, which is caused by initial sampling-frequency deviation estimation, corrected error and the own error of sampling clocks, effectively reducing the bit error rate of the systems and improving the performance of the OFDM systems.