Abstract: The present disclosure discloses a rare earth permanent magnet, its preparation method and motors. The rare earth permanent magnet comprises a light rare earth element and a heavy rare earth element. The light rare earth element must contain Nd and the heavy rare earth element must contain Dy and Tb; along the width direction, the rare earth permanent magnet has two edge portions and one middle portion; along the direction from the outer edge of the edge portion towards the central axis of the middle portion, the weight percentage of Dy gradually increases, while the weight percentage of Tb gradually decreases; the average coercive force of the edge portion is more than that of the middle portion. The rare earth permanent magnet of the present disclosure has a good anti-demagnetization performance.