Abstract: A network link backup system aims to provide network link backup function for electronic equipment (such as a server system, home computer, intelligent home appliance) to maintain normal network operation. The system includes more than one network link module, each including at least one network port, a detection module, a switch unit and a processing module. When the network link module, connected to the electronic equipment, malfunctions, the detection unit generates a control signal to the switch unit, which switches the network path to another backup network link module, to maintain normal network link function of the electronic equipment, thereby enhancing the reliability of the network link of the electronic equipment.