Abstract: A bypass switch device with indicating function is disclosed. The bypass switch device is for use in a network appliance having at least one Ethernet network module, and comprises N switch units and a microcontroller. The microcontroller is configured to change the switching state of at least two said switch units in case the Ethernet network module fails to work normally, such that at least two RJ45 connectors directly communicate with each other through at least two said switch units. In such case, the microcontroller simultaneously controls one of two LED components included by one said RJ45 connector and one of two LED components included by another one said RJ45 connector, such that the two LED components emit lights for indicating that the Ethernet network module is working in a bypass mode.