The invention discloses a teaching assistant system capable of cleaning a blackboard,which comprises a wall body, a cavity opening forward is formed in the wall body, and a blackboard is fixedly arranged on the inner wall of the rear side of the cavity; and sliding cavities are formed in the inner walls of the upper and lower sides in a symmetrical and intercommunicating mode, a moving plate can be slidably arranged between the upper and lower sliding cavities, and the moving plate is internally provided with a cleaning device. According to the teaching assistant system capable of cleaning theblackboard, the blackboard can be quickly and effectively cleaned in two ways, the dust removal function is designed, and the leakage of chalk dust can be effectively reduced.