The invention discloses a method for fault tolerance of transient faults in the EtherCAT message transmission. The method comprises the following steps that firstly, the reliability of EtherCAT's system structure and message transmission is analyzed, and the Poisson distribution is used to forecast the transient fault occurrence probability in the process of sending and transmitting the message according to its master-slave structure and fast transmission mode, so as to obtain the message reliability and the system reliability; then, the control feedback method is applied to the EtherCAT system in combination with the active backup fault tolerance, which is converted into the network utilization change by the statistical deadline error rate, and then the game theory method is used to allocate the network utilization change so as to further change the message back-up number, so that the reliability of the EtherCAT system is improved, and the scheme of the EtherCAT system message scheduling and fault-tolerant approach is formed.