Embodiments of the present invention provide a network virtualization configuration method, a network system, and a device. The method includes: creating a switch virtual machine, where the switch virtual machine is configured to run a virtual switch; responding to a Peripheral Component Interconnect PCI scanning of the switch virtual machine, and configuring, by using the PF driver, a PCIE device to allocate a corresponding network resource to the switch virtual machine; and initializing the PCIE device by using the PF driver, where a default forwarding rule of the initialized PCIE device includes setting a default forwarding port of the PCIE device to a VF receiving queue VF 0 corresponding to the switch virtual machine. According to the method, a cross-platform virtual switch solution can be implemented, thereby improving flexibility of deploying a virtual switch, and implementing compatibility with different hypervisors/VMMs.