The invention relates to an electric self-cleaning teaching blackboard. The electric self-cleaning teaching blackboard comprises a blackboard body, wherein a border surrounding the edge of the blackboard body is arranged on the periphery of the blackboard body; a plurality of duct absorption holes are formed in one side close to the blackboard body, of the border; a dust absorber is arranged at the lower end of the border; a duct absorption port of the dust absorber is communicated with the interior of the border; a motor and a gearbox are arranged at each side of the border; output shafts of the two motors are both connected with the gearboxes close to the motors; gears are arranged in border bodies at the two sides of the border and close to the two gearboxes; output shafts of the two gearboxes are engaged and linked with the racks respectively; a transversally-placed strip-shaped blackboard brush is arranged on the blackboard body; the two ends of the blackboard brush are fixedly connected with the two racks respectively; the two racks drive the blackboard brush to vertically move; the two motors are connected with a controller through circuits; and an air outlet device is arranged on the border body at the upper end of the border. The electric self-cleaning teaching blackboard disclosed by the invention automatically cleans, automatically absorbs dust, and generates an air curtain to prevent dust diffusion.