The invention relates to an organic fluorosilicone polymer, a corrosion protection coating agent with rust and a preparation method of the agent. The structural formula of the polymer is as shown in the specification. The coating agent is non-toxic and harmless, does not cause discoloration of a metal base material after construction, does not damage the appearance surface of the metal, is easy toremove, and is simple and practical. The corrosion protection coating agent with the rust can be used for preventing corrosion on the surface of rusted metal cultural relics, and the surface of the rusted metal cultural relics can be coated only by slight treatment to remove loose substances, grease and other impurities on the surface. The obtained coating layer can obviously improve the corrosion resistance of metal cultural relics, and has excellent aging resistance and weather resistance. The corrosion protection coating agent can replace the traditional derusting process, can be directlycoated on the surface of metal cultural relics, has simple construction operation and obvious economic value, and has very good industrialization prospect.