A network connection method and a device. The method includes: determining, by a routing device, a connectivity state and link quality, where the connectivity state is used to indicate a connectivity state between the routing device and a master device, and the link quality is used to indicate link quality of the routing device; the routing device is the master device or a slave device; and the master device is directly connected to a network side, and the slave device is directly or indirectly connected to the master device; and broadcasting, by the routing device, a first message, where the first message includes the connectivity state and the link quality.