The invention provides a pollution-free treatment method for improving the weathering resistance and the amphiphobic performance of wood, relates to a wood surface treatment method, and solves the problem that a conventional method for improving the weathering resistance and the amphiphobic performance of wood is long in using period, and organic raw materials have toxicity. The treatment method comprises the following steps that 1, plasma cleaning is conducted on the wood; 2, the cleaned wood is placed in a magnetron sputtering apparatus for pre-sputtering; 3, oxygen and argon are introduced, after elemental titanium is oxidized into titanium dioxide ions in the glow state, the wood is sputtered at the power of 300-400 W, the power is adjusted to 100-150 W, and ion sputtering treatment is continued to obtain wood sputtered with a titanium dioxide layer; and 4, the sputtered wood is soaked in an octadecyltrichlorosilane solution, and the soaked wood is dried finally. The sputtering material, namely elemental titanium, is nontoxic, the whole sputtering treatment time is shortened greatly, and the weathering resistance treatment efficiency of the wood is improved.