In　the　electronic　information　age,　and　even　in　the　impending　＇intelligent　era＇,　electromagnetic　wave　(EMW)　absorbers　have　inevitably　received　more　and　more　attention.　However,　their　practical　applications　are　currently　limited　by　a　lack　of　suitable　mass-production　strategies　for　high　performance　EMW　absorbers.　Herein,　we　propose　a　facile　strategy　for　large-scale　and　controllable　preparation　of　NiFe2O4-FeNi/C　(NFO-FN/C)　composites　with　various　microstructural　features　advantageous　to　enhanced　EMW　absorption,　including　core-shell　structure,　porous　structure,　hierarchical　nano-micro　topography,　and　electromagnetic　heterointerfaces.　The　composites　are　synthesized　through　the　confinement　pyrolysis　of　the　polydopamine　(PDA)-coated　NiFe2O4　(NFO),　and　their　microstructural　features　can　be　facilely　tailored　by　changing　the　number　of　PDA　confinement.　The　synthesized　composite　of　NFO-FN/C-2　performs　best　after　two　repetitions　of　PDA　confinement　throughout　the　preparation　process,　with　a　reflection　loss　(RLmin)　of　−68.74　dB　at　a　thickness　of　1.61　mm　and　a　broad　effective　absorption　of　6.37　GHz　at　a　thickness　of　1.9　mm.　This　impressive　EMW　absorption　performance　is　attributed　to　the　synergistic　effect　of　multiple　loss　mechanisms　and　excellent　impedance　matching　derived　from　the　tailored　microstructural　features　of　our　EMW　absorbers.　This　work　provides　a　new　perspective　on　the　large-scale　preparation　of　highly　efficient　EMW　absorbing　materials.　©　2023　Elsevier　B.V.