A hydrophilic-hydrophobic transformable composite film is disclosed, which has an iron-containing substrate; a silicon-containing layer formed on the iron-containing substrate; and a titanium oxide layer formed on the silicon-containing layer. The hydrophilic-hydrophobic transformable composite film uses UV-light to switch its hydrophilic and hydrophobic property. Also, a method of fabricating the above composite film is disclosed. According to the present invention, an anatase oxide layer can be obtained from the sol-gel techniques, in which the particle size of the titanium dioxide is controlled and a modified surface coating with evident photo-catalyticity is achieved.
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