A complete set of gas-insulated and metal-enclosed neutral point device, comprising an arrester, an isolating switch and a discharge gap; the discharge gap comprises a neutral point connection side for conducting with a neutral point of a transformer, and a ground side for grounding; wherein: the arrester and the isolating switch are both closed structures each with a top conductive terminal provided at a top and a ground terminal provided at a bottom; one of the arrester and the isolating switch is provided with a wire inlet cylinder at the top, the other is provided with an adaptive cylinder, and an intermediate cylinder is provided between the wire inlet cylinder and the adaptive cylinder; an intermediate conductor is provided in the intermediate cylinder, an adaptive conductor is provided in the adaptive cylinder, and the intermediate conductor is connected through the adaptive conductor to the arrester or to a top conductive terminal on the isolating switch; wherein the neutral point connection side of the discharge gap is fixed on top of the wire inlet cylinder, the ground side of the discharge gap is electrically connected to the adaptive cylinder or is provided with a ground connection end, a branch conductive structure is provided in the wire inlet cylinder, and the branch conductive structure is simultaneously conducting with the arrester under the wire inlet cylinder or the top conductive terminal on the isolating switch, and a corresponding end of the intermediate conductor and a neutral connection side of the arrester; characterized in that the wire inlet cylinder is also provided with a wire inlet terminal for conducting with the branch conductive structure, and a wire inlet terminal for conducting with the neutral point of the transformer is provided on the neutral point connection side of the discharge gap, the arrester and the isolating switch are arranged vertically, and the neutral point connection side and the ground side of the discharge gap are exposed to the air. the arrester and the isolating switch are both closed structures each with a top conductive terminal provided at a top and a ground terminal provided at a bottom; one of the arrester and the isolating switch is provided with a wire inlet cylinder at the top, the other is provided with an adaptive cylinder, and an intermediate cylinder is provided between the wire inlet cylinder and the adaptive cylinder; an intermediate conductor is provided in the intermediate cylinder, an adaptive conductor is provided in the adaptive cylinder, and the intermediate conductor is connected through the adaptive conductor to the arrester or to a top conductive terminal on the isolating switch; wherein the neutral point connection side of the discharge gap is fixed on top of the wire inlet cylinder, the ground side of the discharge gap is electrically connected to the adaptive cylinder or is provided with a ground connection end, a branch conductive structure is provided in the wire inlet cylinder, and the branch conductive structure is simultaneously conducting with the arrester under the wire inlet cylinder or the top conductive terminal on the isolating switch, and a corresponding end of the intermediate conductor and a neutral connection side of the arrester; characterized in that the wire inlet cylinder is also provided with a wire inlet terminal for conducting with the branch conductive structure, and a wire inlet terminal for conducting with the neutral point of the transformer is provided on the neutral point connection side of the discharge gap, the arrester and the isolating switch are arranged vertically, and the neutral point connection side and the ground side of the discharge gap are exposed to the air.