The application provides a re-synchronization triggering method and a base station. The method comprises the following steps that: after uplink secondary carrier cell (SCC) is activated, the base station immediately triggers re-synchronization, wherein a triggering moment of the re-synchronization is T1; and the base station detects whether a feedback signal of the re-synchronization is received or not within a preset time range, and if so, triggers the re-synchronization, wherein a starting moment of the preset time range is the T1, an ending moment of the preset time range is T2, and a difference value between the T2 and the T1 is less than or equal to 30 milliseconds. The base station immediately triggers the re-synchronization after the uplink SCC is triggered, so that lag time of the re-synchronization can be shortened, and the uplink throughput is increased. If the feedback signal of the re-synchronization is not received within the preset time range, the base station triggers the re-synchronization once again, so that compatibility with different terminals can be realized, and the terminals can correctly demodulate physical downlink control channel commands.