<p>The combination of waterborne epoxy coatings (WECs) and two-dimensional nanofillers is a major method to improve the coating’s anticorrosion performance. In this paper, polyaniline (PANI) is deposited on the surface of hexagonal boron nitride (h-BN) through in situ polymerization to enhance the compatibility between h-BN and WEC. Then, the two oxides (TiO₂ and CeO₂) are loaded on the h-BN-PANI by in situ hydrolysis, obtaining two composite nanofillers (h-BN-PANI@TiO₂ and h-BN-PANI@CeO₂). The structures of composite nanofillers are investigated by FTIR, XRD, and SEM. The anticorrosion performances of WECs with h-BN-PANI, h-BN-PANI@TiO₂, and h-BN-PANI@CeO₂ are evaluated by EIS and salt spray test. The EIS results show that h-BN-PANI@TiO₂/WEC and h-BN-PANI@CeO₂/WEC exhibit the best corrosion resistance, and its low-frequency impedance (<i>Z</i>_{<i>f</i>=0.01&#xa0;Hz}) is one order of magnitude higher than those of pure WEC and h-BN/WEC. In salt spray test, h-BN-PANI@TiO₂/WEC and h-BN-PANI@CeO₂/WEC also show excellent long-term corrosion resistance with few corrosion products even after 600&#xa0;h. Besides, h-BN-PANI@TiO₂/WEC and h-BN-PANI@CeO₂/WEC reflect fantastic adhesion strength. Generally, the excellent protection properties of h-BN-PANI@TiO₂/WEC and h-BN-PANI@CeO₂/WEC are attributed to the presence of PANI and oxides (TiO₂ or CeO₂) on h-BN, which increase the compatibility and surface interactions between two-dimensional nanofillers and waterborne epoxy resin.</p>