The invention provides a closed blackboard eraser box. The closed blackboard eraser box comprises a blackboard eraser wood board and a blackboard eraser box body, wherein blackboard eraser cotton is bonded to the surface of the blackboard eraser wood board; a supporting plate is in joggle joint with the inner wall of the blackboard eraser box body; a supporting rod is welded to the surface of thesupporting plate; a motor is fixedly connected to the surface of the supporting rod; an output shaft of the motor is fixedly connected with a rotating shaft through a coupler; fan blades are welded tothe surface of the rotating shaft; the surface of the rotating shaft is sleeved with a vibration pipe; a limiting rod is welded to the surface of the supporting plate; the surface of the limiting rodis in an L shape; a limiting groove is formed in the surface of the vibration pipe; and one end of the limiting rod is in sliding connection with the inner wall of the limiting groove. The closed blackboard eraser box is simple in structure, a net-shaped elastic mechanism is used for resonating a blackboard eraser, dust on the surface of the blackboard eraser can be efficiently and comprehensively removed, influences of dust on teachers and students are reduced, and the problems that when chalk dust falls off from an existing blackboard eraser, dust is not prone to falling, and the health ofthe teachers and students is seriously affected by the floating dust are effectively solved.