The invention discloses a symbol timing synchronization method and device in an OFDM system. In the scheme, during fine synchronization, signal correlation operation is carried out to obtain at least one peak value, and then a peak value satisfying a preset condition is selected, wherein the preset condition comprises: an absolute value of a difference value of non-demodulated SNR and demodulated EVM is smaller than or equal to a second preset threshold after demodulating a signal behind a position corresponding to the peak value, and the position corresponding to the selected peak value is used as a starting position of symbol timing synchronization, in this way, compared with the prior art, since the absolute value of the difference value of SNR and EVM is smaller than or equal to the second preset threshold, compared with related technology, the accuracy of the found starting position can be guaranteed, and ISI is eliminated to improve the accuracy of symbol timing synchronization.