The investment in laying submarine cables is huge, and man-made failures in offshore areas are frequent. The current technology can only locate the breakpoint after the submarine cable is damaged, but cannot carry out real-time monitoring, early warning and event location for the potential hazard events of the submarine cable. In this paper, a bidirectional interference multi-domain correlation recognition technology is proposed, and the sensor system sensitive to external security violation events is constructed through the existing optical fiber in the submarine cable. Three kinds of events, namely non-event occurrence, knocking optical fiber and pulling optical fiber, are tested and analyzed. The experimental results show that the technique can effectively prevent submarine cable disasters and improve the safety and survivability of important submarine cables.