The invention discloses a portable climbing auxiliary device used for power maintenance. The portable climbing auxiliary device used for power maintenance comprises a pair of bearing plates of the same structure, a box and a footboard, wherein a reciprocating unit is mounted on the bearing plates, the box is mounted on one of the pair of bearing plates, and the footboard is mounted on the box; andthe reciprocating unit comprises a lifting mechanism. The portable climbing auxiliary device used for power maintenance has the beneficial effects that through the cooperation of the lifting mechanism and a clamping mechanism, the problems that a lifting platform is adopted by most existing maintenance devices to rise and fall to maintain electric wires at a high altitude, the size of lifting equipment is too large, and carrying is inconvenient; and the equipment needs to be operated by multiple workers to rise and fall in the lifting process, and consequentially, manpower resources are wasted, and time consumption and labor consumption are high are solved; through the cooperation of a telescopic structure and a driving structure, the bearing plates can stretch or retreat up and down; thebearing plates are fixed to a wire pole through clamping structures with one end fixed and the other ends released so as to clamp the wire pole in a reciprocating mode so that users can climb the wire pole stage by stage through the portable climbing auxiliary device; and the portable climbing auxiliary device is small in size and can be conveniently carried by maintainers.