Pcie exchange-based server system and switching method thereof and device

The invention discloses a PCIE exchange-based server system and a switching method thereof and a device. The system comprises a main PCIE exchange device comprising a communication interface and a first PCIE eachange module comprising at least two PCIE ports; and a standby PCIE exchange device comprising a communication interface and a first PCIE eachange module comprising at least two PCIE ports; wherein the communication interfaces of the main PCIE exchange device and the standby PCIE exchange device are mutually connected, so that the standby PCIE exchange device obtains exchange configuration information of the main PCIE exchange device. According to the system and the switching method thereof and the device provided by the invention, reliability of the system can be raised.