The invention provides a gaseous phase rust-resisting material for rust-resisting seal of a tire bead steel wire. The rust-resisting material comprises a loading layer, a volatile layer, a permeation layer and a protective layer; and the invention further provides a preparation method of the gaseous phase rust-resisting material for the rust-resisting seal of the tire bead steel wire. The method comprises a preparation step of the volatile layer; the volatile layer is a non-woven fabric layer; non-woven fabric is subjected to coating processing; an antirust agent solution is adopted as a coating agent; and the antirust agent solution is prepared from the following raw materials: dicyclohexylamine nitrite, polyethylene glycol and distilled water. According to a gaseous phase sustained-release material prepared by the invention, rust-resisting material damage caused in the process of use due to carrying the tire bead steel wire can be reduced by a large margin; the completeness of the rust-resisting material is improved to the maximum extent; the rust-resisting capacity and rust-resisting time are improved; and the acid and alkali resistant capacity, the anti-aging capacity and the heat resistant capability are improved.