The utility model provides an erasable and writable magnetic board, which comprises a substrate and an erasable, writable and replaceable thin film which can be adsorbed and attached on the substrate, wherein the substrate has a magnetic layer, and a magnetic conducting layer is formed on the erasable, writable and replaceable thin film. After the erasable, writable and replaceable thin film is adsorbed and attached on the substrate, desired content can be written on the thin film, and different thin films can be replaced on the same substrate according to the use requirement. The same content can be available on different magnetic boards only by bringing the thin film and attaching the thin film on other substrates. Compared with the prior art, the application of the magnetic board is more flexible.