The utility model relates to an electric wire appurtenance field, the mode that articulates that aims at solving the overhead ground wire plumb line among the prior art makes overhead transmission line patrol the problem that the line car can not pass through smoothly, provides hooking device and monitoring devices of overhead transmission line overhead ground wire plumb line, and it includes theshaft tower cassette and presss from both sides the on -hook structure, one side of shaft tower cassette is provided with rotates the hole, it constructs including articulating the piece, rotating telescopic link and angle adjustment mechanism to press from both sides the on -hook, axial lead orientation that the telescopic link was rotated along the perpendicular to to the one end of rotating thetelescopic link is provided with rotates, and an activity of rotating is inlayed to locate and is rotated the hole, rotate with the rotation hole between can dismantle the connection through angle stop gear, the other end setting of rotating the telescopic link articulates the piece. Behind the camera, can constitute monitoring devices in addition. The beneficial effects are that, the telescopiclink rotates and the extension, can drive overhead ground wire that double -layered pendant will set up perpendicularly and lift up and push open and reserve through the space in order to patrol the line car for overhead transmission line, and it can pass through smoothly to make overhead transmission line patrol the line car.