The utility model discloses a stair cleaning device which comprises a base, moving units, a pose adjusting unit, a dust collector and a rolling brush, and the moving units are arranged on the two sides of the base and drive the whole device to move. The pose adjusting unit adjusts the position of the rolling brush to enable the rolling brush to go upstairs, and the dust collector is arranged abovethe rolling brush. The whole device is driven by the moving unit to climb on stairs, and the height of the rolling brush is adjusted by the pose adjusting unit, so that the rolling brush is lifted, and the previous step is cleaned. The device is compact and flexible in structure, easy to operate and high in use efficiency, and the workload of people is greatly reduced; the device is good in adaptability.