SOE time synchronization control method and system

The invention discloses an SOE (Sequence of Event) time synchronization control method which is applied to an SOE time synchronization control system. Each controller corresponds to one control station, the controller of one control station is selected in advance as a master controller for time setting, the controllers of the remaining control stations are slave controllers, and the master controller and the slave controllers are connected through hard wiring. The method comprises the following steps: the master controller and the slave controllers of which the initial value of time is preset carry out time synchronization through hard wiring; and the master controller and the slave controllers carry out time synchronization for corresponding SOE modules to realize time synchronization of the SOE modules between the control stations and within the control stations. As the master controller and the slave controllers carry out time synchronization through hard wiring, the precision of time synchronization of the controllers between the control stations is improved (namely, time synchronization of the SOE modules between the control stations and within the control stations is realized), the cost is low, and the balancing between cost and precision is well achieved. The invention further discloses an SOE time synchronization control system.