Method, device and system for preventing security risk of power grid optical transmission equipment

The invention discloses a power grid optical transmission equipment security risk prevention method, optical transmission equipment comprises first network equipment and second network equipment, and the prevention method comprises the following steps: judging the network connection state of the first network equipment and the second network equipment; if the first network equipment and the second network equipment keep network connection, closing a network management physical interface of the first network equipment; and if the network connection between the first network equipment and the second network equipment is disconnected, opening the closed network management physical interface of the first network equipment. By adopting the technical scheme, when the second network equipment is connected with the first network equipment, the first network equipment cannot be accessed and controlled through the network management physical interface, so that the security of the end equipment of the optical transmissi