The fault-tolerant chaotic system synchronization problem is studied in this paper. A synchronization controller based on dynamic event trigger is designed to realize the fault-tolerant chaotic system synchronization. First of all, for the fault existed in the system, the fault-tolerant system model is constructed. Based on the fault-tolerant system model designed, the input-state stability(ISS) method is used to transform the optimal sampling controller problem into the stability problem of the corresponding fault-tolerant system. The sufficient conditions for the fault-tolerant chaotic system synchronization are presented by constructing the Lyapunov functional. The triggering condition designed can modulate dynamically based on system operation condition by introducing dynamic variable, insuring fault-tolerant system synchronization, and the network usage rate is also heavily decreased. Finally, the effectiveness of the proposed method is verified by numerical simulations.