The invention relates to the technical field of amorphous coatings, and particularly discloses a method for improving corrosion resistance of an amorphous coating and application of the method. The method for improving the corrosion resistance of the amorphous coating is characterized in that passivation films are formed through pre-polarization treatment of the amorphous coating, wherein the amorphous coating is prepared by a thermal spraying mode, and the porosity of the amorphous coating is less than 0.6%. On the basis of not adopting an external hole sealing material, a forced pre-polarization method is adopted to force up the further passivation of the passivation films, and the problems of the weak bonding interface of the amorphous coating and weak and non-uniform passivation filmsat the defect positions and the positions near the defect positions are solved; and the generation and homogenization of the passivation films at the positions are promoted, the weak positions which are easy to preferentially corrode are reduced, and the purpose of improving the long-term corrosion resistance of the amorphous coating is achieved. The method is easy and convenient to implement, thecost is low, and the method is suitable for industrial popularization.