The invention provides a quick rusting method for a weather-proof steel plate. The surface of the steel plate is subjected to cleaning treatment through abrasive paper, an angle grinder or shot blasting, namely, manual or mechanical methods are adopted, thus, the surface of the steel plate is free of rust, oil and other attachments and then is sequentially subjected to homogenizing, preoxidation,oxidation and follow-up treatment, that is, a nickel salt solution is made to adhere to the surface of the steel plate through a brush coating method, a roller coating method or a spraying method; a hydrogen peroxide solution is attached to the surface of the steel plate; then, oxidation liquid is attached to the surface of the steel plate; and finally, one or two of water, a sodium chloride solution or a sodium hydrogen sulfite solution are attached to the surface of the steel plate. According to the quick rusting method, the requirements for the construction environment are low, utilized equipment is simple and easy to operate, the implemented technology is simple and easy to carry out, a stable rust layer can be quickly formed on the surface of the weather-proof steel plate, the environment pollution defects such as rust liquid sagging, flying and scattering are avoided, and the quick rusting method is suitable for metallurgical enterprise and construction site operation.