A network routing device, a network data transmission method, and a network access device. The network routing device's first network transmission processing module is configured to convert a received data signal into at least two baseband signals, send one baseband signal to a first radio frequency unit, and send another baseband signal to a first wired communication module. The first radio frequency unit converts the baseband signal into a radio frequency signal and sends the radio frequency signal by using a first antenna, and the first wired communication module converts the baseband signal into a network signal that can be transmitted in a wired transmission medium and sends the network signal to the wired transmission medium for transmission. According to the network routing device, a signal can be transmitted in both a wired manner and a wireless manner. This improves signal transmission reliability.