The invention discloses a safety prompt magnet which comprises a magnetic rubber plate. A reflective paint face layer is arranged on the front face of the magnetic rubber plate. A vacuum suction disc is arranged on the back face of the magnetic rubber plate, and a caution slogan is arranged on the reflective paint face layer. The safety prompt magnet is simple in structure and convenient to use. Due to the fact that the magnetic rubber plate can be attracted to a metal cabinet through magnetism, a prompt effect can be achieved through the reflective paint face layer and the caution slogan on the front face. When a shell of the electrified device is not made of metal materials, the magnetic rubber plate also can be adsorbed through the vacuum suction disc. The reflective paint face layer and the caution slogan have bright and striking colors in great contrast, thereby being clear at a glance. The safety prompt magnet solves the technical problems that the caution effect is poor and safety is low in the prior art.