In order to develop a novel anti-corrosion treatment for alumin m alloy to replace the chromate passivation and realize the process object of quick speed, low temperature and high efficiency. In this study, an environment friendly secondary alkane sulfonate (SAS) modified Li-Al layered double hydroxide (LDH) conversion coating, abbreviated as S-LCC, was prepared through a facile synthetic route of in-situ growth on the surface of 6N01 Al alloy. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR) confirm that SAS anions successfully intercalate into the interlayer of conversion coating. Scanning electron microscope (SEM) images reveal that the original hydrophilic needle-like structure changes into super-hydrophobic flower shaped structure after SAS modification, with contact angle dramatically increased from 52° to 138°. X-ray photoelectron spectroscopy (XPS) analysis indicates that S-LCC is mainly composed of C, O, S, Al and Li in the form of double hydroxides. Neutral salt spray test (NSST) present that compared to the original Li-Al LDH conversion coating abbreviated as C-LCC, S-LCC is basically free from pitting corrosion after 300 h exposure. Potentiodyn mic polarization (PDP) and electrochemical impedance spectra (EIS) demonstrate that polarization corrosion current density is reduced by at least one orders of magnitude and AC impedance is upgraded by nearly one order of magnitude in 3.5% NaCl solution, with a better corrosion performance after SAS modification. The film forming process is discussed and the possible mechanism of corrosion protection of S-LCC is inferred to be a double effect, including the ion exchange of intercalated SAS with chlorides and reconstruction of adsorption film self-assembled by SAS as a barrier against aggressive media. The SAS modified Li-Al LDH of super-hydrophobicity and high corrosion resistance has the potential to be promising alternative for the traditional chromate conversion coatings.