This paper designed and implemented the intelligent circuit breaker monitoring system based on DeviceNet. DeviceNet FieldBus protocol converter of this monitoring system can pass parameters of intelligent circuit breaker like opening state, closing state, current value, etc to DeviceNet FieldBus, monitoring software received the data real-time by using SST_DN3_PCI_1, and processing the data accordingly. Test results prove that DeviceNet FieldBus protocol converter fully meets the DeviceNet specifications, and minitoring system can make circuit breaker “remote control, remote adjustment, remote telemetry, remote motion”. The experiment is successful.