Automatic wiping environment protection blackboard using chalk

The utility model relates to a teaching tool, in particular to a environment-friendly and self-cleaning chalk blackboard, which comprises a writing surface and an eraser. Wherein, the writing surface is a closed annular flat belt 1 and strained by two parallel belt shafts. These two belt shafts are driven by a drive unit to make the flat belt 1 rotate synchronously. A back surface of the flat belt writing surface is arranged with a hard smooth splint 3 closely contacting it. In addition, the eraser 6 is positioned in a scope beyond the writing surface of the flat belt 1 out of the belt shaft and generates mutual frictional moving with an external surface of the flat belt 1. The eraser 6 is sealed by a protective shield 7. The utility model totally renovates modes of traditional blackboards, ensures well feeling of writing with chalk, smooth writing, double writing area and storage capacity, realizes automatic cleaning and seals dust to protect environment.