The utility model relates to a lightning protection of transformer substation device, conductive base including the disc, conductive base is connected with the earth connection electricity, the earthconnection other end is connected with earthing device, the bench insulator has been installed on the plane under the conductive base, the plane is inlayed and is equipped with strong magnet under thebench insulator, conductive base and bench insulator run through has installed the screw, when this device is dismantled to needs, can make it break away from installation base surface through twisting this device of commentaries on classics screw jack -up, reduce the magnetic attraction of strong magnet to installation base surface, thereby convenient to detach, the hinge of the last plane circumference equipartition of conductive base is equipped with a plurality of peripheral movable rods, pole setting in the middle of the last plane central point of conductive base puts and is fixed with,the cover is equipped with the sliding sleeve in the middle pole setting, the sliding sleeve can the axial slide in middle pole setting, the hinge of sliding sleeve border equipartition is equipped with a plurality of connecting rods, connecting rod one end is articulated with the sliding sleeve, the other end is articulated with the peripheral movable rod that corresponds position department.