The invention discloses a ground wire assembly comprising a main rod body and an auxiliary rod body which are arranged in parallel. The top end of the main rod body is provided with a fixing head restraint matched with a wiring terminal. The top end of the auxiliary rod body is provided with a movable head restraint clamped and matched with the fixing head restraint. A guiding aperture is arranged in the fixing head restraint along an axial direction of the main rod body. The tail end of the movable head restraint is movably inserted in the guiding aperture and is in hinged connection with the auxiliary rod body. The middle portion of the main rod body is provided with an adjusting gear in a rotatable mode. The axis of the adjusting gear is perpendicular to the axis of the main rod body. A matched surface between the tail end of the auxiliary rod body and the main rod body is provided with a tooth bar engaged with the adjusting gear in a matched mode. The connection structure of the ground wire assembly is safe and reliable, and the operation process is simple to perform.