Writing plate having mechanical arm

The utility model discloses a writing plate having a mechanical arm, comprising a writing plate and a mechanical arm. The writing plate is provided with a transmission device capable of sliding from left to right. The mechanical arm is disposed on the transmission device. The transmission device is electrically connected a drive motor disposed at one side of the writing plate. The contacting face between the mechanical arm and the writing plate is provided with a plate eraser. The writing plate having a mechanical arm is advantageous in that time is greatly saved when a person is involved in other business or when a person has no effort to clean a white board; the writing plate having a mechanical arm has the same force as a person or even has more force than a person does; the mechanical arm will wipe the plate to and fro without the management of people, and the writing plate can be erased clean after a while.