The present invention provides a Gigabit dual-optical port server adapter, the adapter includes a first PHY layer controller, a second PHY layer controller, a MAC layer controller, a PCIE interface and two Gigabit optical fiber ports, Wherein, the MAC layer controller includes a bus interface, a receiving buffer module, a sending buffer module, a flow control module, a receiving module, a first sending module, a second sending module, a first PHY interface, a second PHY interface and a link failure judgment module ;The adapter supports the computer interface, and provides a main port and a backup port, one of which is a working port, and the other is a backup port. When switching to another link, the connection state of the network is guaranteed, which realizes non-inductive switching, reduces transmission delay, and improves transmission efficiency.