Ash collector of eraser

The utility model relates to a dust collector of a blackboard eraser. The utility model comprises a shell and a motor. The shell is provided with an intermediate partition board inside. The intermediate partition board is provided with an air vent in the middle. A rotary shaft of the motor is connected with a wind wheel. The motor and the wind wheel are combined and arranged at one side of the intermediate partition board in the shell. The other side of the intermediate partition board in the shell is provided with a net cover. The net cover is provided with a cyclone separator inside. A box cover with an air inlet is arranged above the shell. The motor rotates in high speed, drives the wind wheel to work, and forms negative pressure. The chalk dust adhered to the surface of a blackboard eraser is sucked following the air, and then, enters into a dust collection box. Most of the dust sinks into the box bottom through the cyclone separator in order to avoid rapidly clogging the net cover. The blackboard eraser and the dust collector of the utility model are separated. The blackboard eraser can be a conventional blackboard eraser. The utility model has the advantages of convenient operation and light weight, adopts alternating currents, and is more convenient and more economic than using direct-current batteries.