The invention discloses a power transmission line vertically-arranged lead switching-off and grounding connection type and method. The connection type comprises a pair of switching-off points arranged in an upper lead tension direction, wherein the two switching-off points are connected through employing a tension insulator, grounding wires are led out at the switching-off points through tension wire clamp leading boards, the grounding wires naturally sag under the gravity action, and the grounding wires are perpendicularly connected with an upper lead, a middle lead and a lower lead. Electrical connection in one same lead tension direction is switched off through employing the tension insulator, inter-phase insulation is guaranteed through utilizing the inter-phase insulator to directly form grounding of the line switching-off points, and a safe, reliable and flexible grounding mode is realized. The connection type is advantaged in that switching-off and grounding at any position of the vertically-arranged lead can be directly carried out, flexibility and reliability are realized, establishing a tower is not needed, a mounting speed is fast, the power failure time is short, and cost is substantially saved.