The invention provides an exception message processing mechanism applied to a RapidIO switching network, which relates to a RapidIO message sending module and further comprises an interrupt processingmodule, a semaphore processing module and an exception message processing module which are newly arranged. According to the method, the inter-process communication mechanism based on semaphore and the interrupt processing mechanism are matched and applied to the RapidIO switching network, so that the abnormal message sent by the processor can be discovered in time, and the task of sending the abnormal message by the processor can be ended in time; the function of clearing abnormal messages sent by the processor is achieved, crash of the processor is prevented, it is ensured that the whole switching network is not affected, the stability and reliability of the switching network are enhanced, losses caused by system restarting are avoided, and the labor cost of manual system restarting is saved.