The present invention provides a communication timing synchronization method and device for use in a DFT-S-OFDM system. The communication timing synchronization method comprises the following steps: acquiring the sum of the received signal vectors of a transmission signal that passes through N paths of a fading channel wherein the transmission signal is a normalized N-point sampling complex signal with N being the integer power of 2; calculating the cross-correlation values of the N transmission-and-received signals point by point to determine a maximum cross-correlation value among the cross-correlation values; and calculating a check statistic based on a value near the maximum cross-correlation value and an autocorrelation value of the received signal wherein the check statistic is used to determine a threshold for the associated timing synchronization so as to determine the starting point of the communication frame. The technical schemes of the invention can determine the threshold value of the check statistic of timing synchronization for a DFT-S-OFDM communication system in the fading channel, and then according to the starting point of the communication frame determined by the threshold value, realize the timing synchronization of the data frame.