The invention discloses a ground lead special insulated operating device and a locking device. The locking device specifically comprises a shell, a movable part, a fixed shaft, a locking part, a locking spring, a guide post and a movable block. The fixed shaft is fixedly connected to the right side of the center of the interior of the shell. The movable part is movably connected to the fixed shaft. The left lower side face of the movable part is connected with the right side face of the movable block. The left upper side face of the movable part is connected with the right lower side face of the locking part. The left side and the right side of the locking part are movably connected to the interior of the upper side of the shell. A locking spring is arranged between the interior of the left upper side of the locking part and the left side face of the interior of the upper side of the shell. The movable block is vertically and movably connected to the left side of the interior of the shell through the guide post. According to the locking device, when a connecting disk moves downwards to drive the movable block to move downwards, the locking part is made to move leftwards to be separated from grooves through the movable part, and it is guaranteed that a winding disk can rotate to unwind and wind a ground lead. Accordingly, it is effectively guaranteed that the ground lead can be unwound or wound only after a grounding screw rod is grounded, and the safety performance of the locking device in the using process is further guaranteed as well