Aiming at the problems of traditional blackboard eraser, such as fugitive dust, incomplete wipe and poor use effect, etc. The article designed a negative pressure adsorption dustless blackboard eraser. The blackboard eraser is separated by a coarse filter net, with a compressed cavity inside. The negative pressure generated by fan drainage is used to absorb the dust generated by cleaning in real time. Through fluid simulation analysis and experimental test, the dust absorption rate can be more than 90%. At the same time, the blackboard eraser adopts wireless automatic charging, which has super-long standby performance.