The utility model provides a but height -adjusting's laborsaving device of wipeing wall belongs to the building field, including the U -shaped frame, the U -shaped frame is provided with first slide,sliding sash, second slide, slide bar, movable rod, U -shaped frame, adhesive hair roller, funnel cylinder, wand cap, recovery box, drawer box, a fixing bolt, push rod, first handle, telescopic link,second handle, loop bar, backup pad, pulley and the 2nd fixing bolt, first slide has two, respectively the medial surface department of vertical setting side frame around the U -shaped frame, the utility model discloses a sliding sash slides from top to bottom along first slide, the slide bar slides around the second slide, the activity is controlled to the movable rod on the slide bar, when needsare wipeed wall, be stained with coating with the adhesive hair roller earlier, then promote the movable rod right for the adhesive hair roller is contradicted on the wall, along second slide slip slide bar, makes the adhesive hair roller swabbing that rolls in front of along, and lapse sliding sash whitewashes the downside wall again.