The　composites　of　3,4,9,10-perylene　tetracarboxylic　acid　doped　polyaniline　(PTCA-PANI)　have　been　successfully　fabricated　by　oxidative　polymerization　method　in　hydrochloric　acid　solution.　FTIR,　SEM　and　XRD　were　employed　to　characterize　the　composition,　morphology　and　structure　of　PTCA-PANI　composites.　Thermalgravimetric　analysis　results　showed　that　PTCA-PANI　composites　had　better　thermal　stability　than　PANI.　The　microwave　absorption　performance　of　the　obtained　composites　was　evaluated　by　measuring　the　reflection　loss　(RL)　values.　The　widest　absorption　bandwidth　of　the　optimal　PTCA-PANI　(PTCA-PANI04)　composites　could　reach　to　4.4　GHz　(11.9–16.3　GHz)　at　the　absorber　thickness　of　2.0　mm,　while　the　minimum　RL　was　−27.8　dB.　And　the　absorbing　frequency　could　be　regulated　in　the　range　of　3.8–18　GHz　by　adjusting　the　absorber　thickness.　Furthermore,　the　corrosion　protection　performances　of　the　prepared　materials　incorporated　epoxy　coatings　were　investigated　by　electrochemical　impedance　spectroscopy　and　potentiodynamic　polarization.　The　results　indicated　that　PTCA-PANI04　incorporated　coating　displayed　a　long-term　excellent　anti-corrosion　efficiency,　which　was　99.98%　after　15　days’　immersion　in　3.5%　NaCl　solution,　owing　to　the　passivation　and　barrier　effects　of　PTCA-PANI04　composites.　This　work　can　provide　a　reference　for　the　development　of　new　materials　with　electromagnetic　shielding　and　corrosion　protection　dual-function.　©　2022