In view of the current way of artificial erase the blackboard, this paper puts forward a new way of intelligent erasure. The system takes blackboard as the control object, the interactive interface as the terminal, and uses the embedded technology and stepper motor control technology to realize the collection of blackboard images, extraction of the blackboard coordinates, transmission of serial port data and control of stepper motor. The experimental results show that this system can clean the blackboard automatically, and has the advantages of flexibility, high integration, and convenience etc.