［Objective］To achieve high-efficiency corrosion resistance of chromium-free Zn-Alsystem under ultrathin coating conditions.［Methods］A multifunctional composite coating system was constructed，using hydrogenated bisphenol A epoxy resin as the matrix，flake Zn-Al powder as the anti-rust pigment，and compounded with nano-indium oxide and PTFE-modified polyethylene wax powder.［Results］Compared with conventional spherical zinc powder，flake Zn-Al powder，arranged through face-to-face contact，significantly improves the coating′s conductivity and physical shieldingperformance. When the aluminum powder accounts for 7% of the total zinc-aluminum mass，it can effectively inhibit the dissolution rate of the Zn anode and the formation of white rust. The appropriateaddition of nano-indium oxide（1%）can enhance the stability of the coating′s microscopic conductive pathways，and through the synergistic mechanism of local electron migration and Cl⁻ . adsorption， significantly extend the cathodic protection period. The introduction of low-melting-point PTFE-modified PE wax powder allows for directional migration and enrichment to the coating surface duringthermal curing，forming a dense hydrophobic surface layer that further blocks the penetration of corrosive media，thereby synergistically enhancing corrosion resistance.［Conclusion］ This coating system demonstrates excellent mechanical stability and long-lasting corrosion resistance，showing potential as a green alternative Zn-Al anti-corrosion coating.