［Objective］To solve the problem of rapid failure of acrylic polyurethane coating after defects or local damage.［Methods］ This study employed a one-pot synthesis strategy to in situ polymerize pyrrole（PPy） onto the surface of cetyltrimethylammonium bromide（CTAB）-modified graphene，producing Gr-PPy nanoparticles for incorporation into acrylic polyurethane anticorrosion coatings. The microstructure and composition of Gr-PPy nanoparticles were characterized using scanning electron microscopy（SEM），Raman spectroscopy，and Fourier-transform infrared spectroscopy（FT-IR）. The corrosion resistance of the coatings was evaluated via electrochemical impedancespectroscopy（EIS） and neutral salt spray（NSS） tests.［Results］ The acrylic polyurethane coating modified with Gr-PPy powder（PPY）exhibited significantly enhanced corrosion resistance. Notably， the PPY3 coating demonstrated optimal corrosion resistance：after 42 days of immersion in 3. 5%NaCl solution，its impedance modulus at 0. 01 Hz remained at 5. 3×10¹⁰ Ω ·cm²，and it showed the least severe corrosion after 672 hours of NSS test.［Conclusion］The excellent anticorrosion performance of the PPY3 coating was attributed to the synergistic effects of the physical barrier provided by impermeable graphene sheets and the passivation induced by PPy.