Embodiments of the present disclosure disclose a synchronization signal sending method, including: determining, by a transmit end device, a first signal, where the transmit end device operates in a serving cell, the first signal includes a first synchronization sequence, the first synchronization sequence is a sequence obtained after a special ZC sequence is cyclically shifted by a first quantity of digits and then dot multiplication or conjugate multiplication is performed on the cyclically shifted special ZC sequence and a characteristic sequence, the special ZC sequence is a ZC sequence with a root index being +1 or −1, and the characteristic sequence and/or the first quantity of digits are/is corresponding to a cell identity of the serving cell. In the synchronization signal sending method provided in the embodiments of the present disclosure, signal synchronization can be implemented in an M2M technology by using the ZC sequence.