Effective surface passive cooling and superhydrophobicity is vital for promoting more flexible application of energy power system for aircraft and aerospace. Here, we experimentally demonstrate a fractal-patterned coating on TA15 titanium alloy for superhydrophobic and passive cooling performance through plasma electrolytic oxidation and hydrothermal treatment successively. The coating exhibits excellent corrosion resistance and self-cleaning properties, largely thanks to the fractal structure and low surface energy. Additionally, the micro-hole's infrared trapping effect and TiO2 lattice absorption significantly increase the emissivity over the thermal wavelength range. When functioned on a titanium radiator, such a coating can reduce the temperature by as much as 9.3 degrees C. Therefore, the passive heat dissipation and superhydrophobic multi-functional coatings are expected to be a promising candidate for heat exchange equipment that requires exposure to harsh external environments.