Titanium dioxide (TiO2) was prepared on the surface of hexagonal boron nitride (h-BN) by in-situ hydrolysis of titanium tetrachloride. TiO2 modified h-BN nanocomposite filler (h-BN@TiO2) was obtained and added to water-based epoxy coating (WEC) to prepare h-BN@TiO2 /WEC composite coating. FTIR, XRD and SEM tests show that TiO2 is successfully supported on h-BN nanosheets, which is conducive to increasing h-BN layer spacing and reducing accumulation. The corrosion behavior of h-BN@TiO2/WEC composite coating was studied by electrochemical impedance spectroscopy (EIS) and salt spray experiment. The results show that after soaking NaCl solution with a mass fraction of 3.5% for 600 h, the coating resistance of h-BN@TiO2 /WEC composite coating increases from 9.884×105 Ω·cm2 to 5.055×106 Ω·cm2 compared with pure WEC. And its low-frequency impedance (Zf= 0.01Hz) is always the highest and most stable. Meanwhile, the 600 h salt spray test results prove that the addition of h-BN@TiO2 to the waterborne epoxy coating can effectively slow down the diffusion rate of corrosive medium to the coating, and improve the shielding and anti-corrosion properties of the coating.