The invention provides a processing method for ion exchange property powder, which ensures that the ion exchange powder has a suitable ion exchange form. The method comprises the following steps: dipping the ion exchange powder into an aqueous alkali; after the dipping is finished, filtering out the aqueous alkali and drying and crushing for use. The operation is very convenient. The zinc-rich paint filling using the powder comprises the following components in parts by weight of 80-99 parts of zinc powder, 1-10 parts of ion exchange property powder and 0-10 parts of pigment. The ion exchange property powder is added into the zinc power and prepared into a zinc-rich paint together with a filming main agent; the zinc-rich paint is coated on the steel surface; and after solidification filming, an electrified bridge is built between the zinc powder and zinc powder as well as between the zinc powder and steel; and therefore, although the zinc powder in contact with the steel base body is all replaced by corrosion products, the zinc powder at the other parts can still continually provide electrochemical protection effect through the electrified bridge built by the ion exchange property powder, thus improving the corrosion resistance of a coating.