The present disclosure provides a wireless network system and a smart device management method using LED lighting devices. The wireless network system includes a wireless router and a plurality of LED lighting devices with WI-FI modules that have wireless access and network switch capabilities. Through the WI-FI modules, the LED lighting devices may access the wireless network provided by the wireless router or the WI-FI modules of any other LED lighting devices that have been wirelessly connected to the wireless router. The network address of the wireless router and the network addresses of the LED lighting devices are in the same network segment. The present disclosure provides a wireless switch cascade method. The WI-FI module of the LED lighting device has wireless switch capabilities, allowing the IP address of the accessed devices and the module itself to be in the same network segment, and enabling centralized control of the connected devices. The smart devices in a home or office environment therefore are not limited by space and can wirelessly interconnect freely, further enhancing the users' smart home user experience.