In　this　work,　PUF/PU@IPDI　(PPI)　polymer　shell　microcapsules　were　synthesized　through　interfacial　polymerization　and　in　situ　polymerization.　Subsequently,　a　layer　of　metal　Ni　was　plated　on　the　surface　of　microcapsules　to　fabricate　Ni/PUF/PU@IPDI　(NPPI)　composites.　The　results　revealed　that　NPPI　microcapsules　exhibited　superior　thermal　stability　and　mechanical　properties,　and　NPPI-60　obtained　the　greatest　strength　(102.8　MPa).　The　minimum　reflection　loss　(RL)　value　of　the　NPPI-20　composite　was　up　to　−32.8　dB　at　5.5　mm　and　the　corresponding　effective　absorption　bandwidth　(EAB)　was　2.4　GHz.　Additionally,　the　NPPI-10　composite　displayed　the　highest　healing　efficiency　(78.6　%　and　86.6　%　for　the　scratch　depth　and　width,　respectively),　and　the　mechanical　strength　and　fracture　toughness　of　epoxy　resin　were　enhanced　by　the　addition　of　metal　microcapsules.　The　core-shell　structure　established　by　electroless　plating　can　endow　self-healing　microcapsules　with　outstanding　mechanical　characteristics　as　well　as　good　wave　absorption　capability,　indicating　that　NPPI　composites　have　promising　applications　in　the　field　of　electromagnetic　wave　absorption　and　function　and　structure　integration　design　of　composites.　©　2024　Elsevier　Ltd