The invention belongs to the field of rear earth magnetic materials and discloses a method for preparing a corrosion-resistant neodymium ferro boron permanent magnet. The method includes the steps: subjecting neodymium ferro boron powder to oil removing, acid pickling, activating and chemical plating in plating solution, drying, orienting in a magnetic field, forming, initially pressing and calcining. The neodymium ferro boron permanent magnet prepared by the method is high in corrosion resistance and pretty high in residual magnetism Br, coercive force Hc and magnetic energy product BH, and the integral corrosion resistance of the neodymium ferro boron permanent magnet is insusceptible to superficial damage.