The invention discloses a maintenance block for vertical twin bundled conductors, and solves the problems that the maintenance is difficult and potential safety hazards are caused because a longer distance is kept between upper and lower conductors when conventional maintenance blocks (mostly adopting a single-conductor-hitching-leg structure) suitable for vertical twin bundled conductors are used for conductor maintenance under the action of gravity. The maintenance block comprises support pillars on which pulley hitching leg components and sitting rack components are arranged, wherein the pulley hitching leg components comprise two vertically distributed hitching leg racks; two central shafts are respectively arranged in the two hitching leg racks in a penetrating manner; pulleys are arranged on both of the two central shafts; and a telescopic connection bar is connected between the two hitching leg racks. Owing to the dual-hitching-leg structure, the distance between upper and lower conductors can be stabilized, and the distance between the two hitching legs can be adjusted according to the distance between different conductors.