The novel invention relates to an auxiliary climbing device and method for electric power overhauling. The technical scheme is as follows: the auxiliary climbing device comprises a flexible ladder, a connector, a supporting rod, a hanger and a cross beam, wherein the two sides of the flexible ladder are flexible connection belts; the middle parts of the flexible connection belts are connected by horizontal alloy rods; a connecting fastener is arranged at the top part of the flexible ladder, and penetrates through the connecting fastener to connect the flexible ladder and the supporting rod; cross beams are fixed at the two sides of the supporting rod; the hanger is fixed at the top part of the supporting rod. The auxiliary climbing device has the beneficial effects that a rod-climbing operator overcomes the inconvenience due to higher arrangement of steel ladder-climbing foot studs in the rod-climbing process, and the labor intensity of the operator is reduced; in addition, the operation is simple, the carrying is convenient, the problem that a maintainer does not want to carry since the original auxiliary climbing ladder is heavier is solved, and the operator goes up and down by the novel auxiliary climbing ladder, so that the safety of the operator is guaranteed, the carrying is convenient and the use method is simple and convenient.