The present disclosure provides a WiFi network bridge, a WiFi-based communication method and system, the WiFi network bridge of the present disclosure may first acquire LTE communication link information, after receiving a WiFi connection establishment request sent by a WiFi terminal, establish a WiFi communication link with the WiFi terminal, and send authentication request information to a LTE base transceiver station; then the WiFi network bridge may judge whether the authentication succeeds, and if the authentication succeeds, a LTE communication link with the LTE base transceiver station is established according to the acquired LTE communication link information. That is to say, the present disclosure implements the backhaul of a WiFi AP network by using a LTE wireless network, avoiding the need to deploy a wire backhaul every time before a WiFi AP network is deployed, thereby the network topology of WiFi communications can be simplified, the engineering cost and usage cost can be lowered, and the satisfaction of user experiences can be improved.