With　the　development　of　science　and　technology　and　electronic　industry,　electromagnetic　wave　pollution　has　become　the　fifth　largest　pollution　in　the　world　today,　so　it　is　very　important　to　develop　a　material　with　good　wave　absorbing　properties.　In　this　study,　polyaniline　was　loaded　onto　the　surface　of　carbon　nanotubes　(CNTs)　bundles　in　Buckypaper　by　electropolymerization,　and　epoxy　resin　was　used　as　the　matrix　to　prepare　a　polyaniline　(PANI)/Buckypaper/EP　composite　absorber　with　integrated　structure　and　function.　The　research　shows　that　the　CNTs　are　prepared　into　Buckypaper　with　a　three-dimensional　porous　structure　by　vacuum　filtration.　This　three-dimensional　porous　structure　ensures　that　CNTs　can　be　added　at　a　high　content　and　uniformly　dispersed　in　epoxy　resin.　PANI　adjusts　the　impedance　matching　of　Buckypaper　and　adds　more　loss　mechanisms.　Under　the　optimal　matching　thickness　of　1.5　mm,　the　optimal　reflection　loss　reaches　−29.31　dB,　and　the　absorption　bandwidth　is　3.12　GHz.　At　the　same　time,　the　interaction　between　the　π–π　noncovalent　bond　of　PANI　and　the　delocalized　π　electrons　on　the　surface　of　CNTs　improves　the　mechanical　strength　of　Buckypaper.　The　tensile　strength　reached　42.17　MPa,　an　increase　of　92.82%　compared　with　pure　BP/EP.　The　research　in　this　article　is　expected　to　provide　a　feasible　idea　for　the　preparation　of　structure–function　integrated　materials.　©　2022　Wiley　Periodicals　LLC.