The invention relates to a cutting pliers device of processing a self-adhesive tape of a 10kV bus bridge in an electrified mode. The cutting pliers device includes a cutting pliers head, a fixed jaw and a movable jaw. A slidable impact rod is arranged in the fixed jaw. The surface of the fixed jaw is provided with an impact sldieway. A limit pin on the impact rod slides along the impact slideway when the impact rod is sliding. The top of the impact rod is provided with a cutting pliers cutter head. The fixed jaw, a fixed jaw stand, a movable jaw support arm and the movable jaw are connected through a mandrel. The movable jaw enables the fixed jaw to be open and closed by pulling of a movable jaw pulling mechanism. Through an earth potential working method in an electrified mode, a suspending self-adhesive tape of a 10kV bus bridge of a running transformer is processed in an electrified mode, thereby preventing inter-phase short circuits of the bus bridge or single-phase grounding and accidents of a power grid system. In this way, full cut-off risks of running of the bus bridge of the transformer are reduced; and a lot of switching operations caused by temporary power failures of equipment and a bus are avoided to ensure safe production and reliable power supplying.