Stair sweeper

The utility model discloses a stair sweeper. Including a first frame, a top plate and a bottom plate are respectively arranged at upper and lower ends of the first rack; a dust collection device is arranged on the bottom plate; a driving wheel assembly and a brush assembly are arranged at the bottom of the bottom plate. Wherein a lifting plate capable of moving up and down relative to the first rack and a lifting mechanism for driving the lifting plate to move are arranged on the first rack; a second rack capable of horizontally reciprocating relative to the lifting plate is arranged on the lifting plate; the second rack is provided with a reciprocating mechanism for driving the second rack to move, the two ends of the second rack are provided with a first supporting rod and a second supporting rod respectively, the height of the first supporting rod and the height of the second supporting rod can be adjusted, and the height difference between the first supporting rod and the second supporting rod is equal to