The present invention relates to a method for modifying a coating surface by heavy ion beam irradiation, more specifically preparing a base material; Coating a coating material including a TiO 2 sol solution or a TiO 2 -SiO 2 hybrid sol solution on the surface of the base material; And exposing the coated base material surface to the heavy ion beam generated from the heavy ion beam irradiation apparatus. And coating a second coating material on the surface of the coated base material irradiated with the heavy ion beam, wherein the energy of the heavy ion beam is 1 MeV or more, the surface of the TiO 2 coating or the TiO 2 -SiO 2 hybrid coating by heavy ion beam irradiation. It is about a reforming method. By using the surface modification method of the TiO 2 coating or TiO 2 -SiO 2 hybrid coating by the heavy ion beam irradiation of the present invention, it is possible to improve thermal stress, corrosion resistance and adhesion at high temperatures of the coating.
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