In　practical　wastewater　treatment,　microporous　polymers　and　polyphenolic　materials　often　suffer　from　limited　adsorption　performance　for　heavy　metal　ions,　primarily　due　to　the　restricted　pore　structure　of　the　former　and　the　poor　chemical　stability　of　the　latter.　Herein,　a　novel　EA@CMPA　composite　is　developed　via　in-situ　confinement　of　ellagic　acid　(EA)　within　Conjugated　Microporous　Poly(aniline)　(CMPA)　for　efficient　Hg(II)　removal.　EA　is　anchored　within　CMPA　through　dual　interactions:　(i)　hydrogen-bonding　and　(ii)　protonation.　This　design　endows　the　composite　with　hierarchically　structured　mesoporous　diffusion　channels　and　abundant　active　adsorption　sites,　thereby　enabling　EA@CMPA　to　enhancement　of　the　adsorption　kinetics　and　capacity.　The　resulted　EA@CMPA(200)　has　high　Hg(II)　adsorption　rate　h　of　640　mg　g-1　min-1　and　adsorption　capacity　of　1024　mg　g-1.　Notably,　EA@CMPA　maintains　a　regeneration　efficiency　over　81.5%　after　7　cycles　of　intensive　reuse,　demonstrating　that　the　water-soluble　ellagic　acid　is　efficiently　confined　within　the　pore　channels.　It　also　exhibits　excellent　anti-interference　ability　and　selectivity　in　actual　Hg-containing　wastewater,　with　Hg(II)　removal　rate　of　95.41%　and　selectivity　approaching　100%.　The　adsorption　behavior　and　mechanism　are　characterized　by　FT-IR,　XPS,　and　DFT　calculations,　revealing　that　the　synergistic　interactions　between　C=O　and　–NH–　sites　drive　superior　Hg(II)　capture.　This　study　highlights　the　potential　of　EA@CMPA　as　a　high-performance　adsorbent　for　mercury　remediation.　©　2025　Elsevier　Ltd