Electricity-free environment-friendly blackboard eraser capable of automatically and circularly removing and depositing dust

The utility model discloses a power-free automatic circulation dust removal and deposition environment-friendly blackboard eraser which comprises an outer shell and an inner shell, the outer shell is located on the rear side of the inner shell, the inner shell is provided with a first cavity and a second cavity, the first cavity is located above the second cavity, an opening of the first cavity is far away from the outer shell, and the opening of the second cavity is located above the outer shell. An opening of the second cavity is close to the shell, a dust wiping device, a dust brushing device and a stop device used for stopping the dust wiping device from rotating are contained in the first cavity, the dust wiping device is located on the front portion of the first cavity, the dust brushing device and the stop device are located on the rear portion of the first cavity, and the dust brushing device is located in the second cavity. Part of the dust wiping device extends out of the opening of the first cavity