The invention provides a method for preparing a super-hydrophobic surface. Firstly, mixed solution of polystyrene and polymethyl methacrylate is dip-coated on a substrate material, a settled layer is formed on the surface of the substrate after a solvent is volatilized, then the substrate material and the settled layer are soaked in cyclohexane, and a super-hydrophobic film with a coarse microstructure is formed on the surface of the substrate material through drying. A contact angle between the film and the water is more than 150 degrees, so the super-hydrophobic performance is achieved. The preparation method has the advantages of simple and convenient operation, simple equipment and cheap raw materials; the prepared super-hydrophobic surface film has excellent hydrophobic performance and stable property; and the preparation method can prepare the large-area super-hydrophobic film and perform scale production.