Electric blackboard eraser capable of collecting chalk dust

The invention discloses an electric blackboard eraser capable of collecting chalk dust. The electric blackboard eraser comprises a bottom plate, a panel and a supporting plate; the supporting plate isarranged between the bottom plate and the panel; the side edges of the bottom plate, the side edges of the panel and the side edges of the supporting plate are connected through rechargeable batteries; a cover plate is connected to the top ends of the bottom plate, the panel and the supporting plate; a closing cover is hinged to the bottom end of the bottom plate through hinges and is clamped atthe bottom end of the panel; motor shafts are connected between the bottom plate and the supporting plate, are sleeved with motors and fans and penetrate through the bottom plate to be connected withbrush plates; brushes are connected to the outer side edges of the brush plates; a switch is connected onto the cover plate; and the rechargeable batteries are electrically connected with the motors through the switch. The brus