The present invention is a wet electric blackboard eraser in the shape of a small vacuum cleaner that will make a big difference in the classroom culture. In detail, two wet electric filters (roller type) clean the steel board and use a brush. It is about how to remove the remaining water.;To this end, the present invention has to return two wet electric filter (roller type) to the electric motor, and supply water or liquid in the water purifier to the wet electric filter (roller type). One brush washes the surface of the board and removes the water completely. The filtered water is introduced into the water purifier and passes through the water filter to enter the water purifier. It will be of great help to the liberation of students, to a clean and pleasant classroom environment, as well as to the health of teachers and students (other than respiratory disorders), and will be useful in many places of daily life.
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