The utility model relates to a high tension transmission line live working specialized tool - - - advance current potential seat ladder, specifically be ultra -high voltage transmission line advanceson way current potential seat ladder. The problem of it is unreasonable that current transmission line advances current potential seat ladder structure, and the operator person operational risk who brings is great to and current transmission line advances current potential seat ladder and is not suitable for extra -high voltage transmission line is solved. This ladder includes the terraced main part of seat that comprises two insulator spindles that are parallel to each other, fixedly connected with bedplate between two insulator spindles of the terraced main part of seat, and the top of two insulator spindles is provided with the link, the lower extreme of two insulator spindles is provided with the fixed hook. It shifts stick and equipotential metal pole still to be equipped with the current potential on this ladder. The utility model has the characteristics of seat ladder firm reliable, take comfortable, operation safety, convenient and fast, the live working on mainly used ultra -high voltage transmission line way also can be used to the live working on super ultra -high voltage transmission line way.