One-way transmission network card and control method thereof

The invention discloses a one-way transmission network card and a control method thereof. The network card comprises a golden finger module, a network controller chip, a network PHY chip, an SPI firmware chip, a power supply chip and an optical module interface. The optical module interface is connected with the network PHY chip; the upstream of the network controller chip is connected with a terminal through a golden finger module; the downstream of the network controller chip is connected with a network PHY chip through an RGMII interface and an MDIO management interface, and outputs a gigabit network port; the SPI firmware chip is connected with the network controller chip through an SPI interface; the optical module interface is used for connecting an optical module through a single optical fiber patch cord; the method comprises the steps that the network PHY chip configures the value of a related register through an MDIO management interface of the network controller chip so as to achieve the one-way mod