The work aims to prepare hydrophobic coating of wear resistance, corrosion resistance and high bonding strength on the aluminum alloy surface. The AT (Al3O2-TiO2) coatings were prepared on the substrate of the aluminum alloy by using atmospheric plasma spraying (APS). The PTFE coatings were prepared on the surface of AT coating by virtue of sol-gel method. The microstructure, composition, roughness and static contact angle were characterized by scanning electron microscope, X-ray diffraction, 3D topography tester and contact angle tester, respectively. Provided with following process parameters: spray distance of 120 mm, current of 680 A and powder feeding rate of 18 g/min, the roughness of solid powder AT coating and hollow powder AT coating is 6.99 μm, 6.13 μm, respectively; porosity 5.88%, 15.18%; hardness 945.82HV0.3, 768.1HV0.3; adhesion force with matrix 32 MPa, 28 MPa; and adhesion force between the solid AT coating and PTFE coating 19 MPa. The static contact angle of the solid PTFE/AT composite coating with water was up to 130.9°. The surface of PTFE coating contained fluoride and silicide. The overall performance of AT coating prepared by solid irregular AT powder is significantly superior to that of AT coating prepared by hollow spherical AT powder, and the roughness of solid AT coating is higher than that of the hollow AT coating. Therefore the solid AT coating is chosen as the substrate of composite coating. The solid PTFE/AT composite coatings have a nanostructure dual rough structure similar with lotus leaf surface. The composite coating is of good hydrophobic properties, the hydrophobic property related to the hydrophobic groups of the fluorine-containing substance on the coating surface and the dual rough structure with low surface energy.