New　strategies　are　required　to　modify　adsorbents　that　possess　numerous　accessible　chelating　sites　with　high　utilization,　in　order　to　achieve　both　rapid　uptake　and　high　capacity　for　the　contaminants,　which　are　still　urgently　needed.　This　study　introduces　a　novel　integration　of　a　conjugated　microporous　polymer　(CMP)　material　with　conventional　polyaniline,　representing　the　first　instance　of　such　a　combination.　By　amalgamating　the　doping　properties　of　polyaniline　with　the　highly　stable　structure　and　extensive　microporous　attributes　of　CMP,　we　achieve　a　synergistic　effect.　The　conjugated　microporous　polyaniline　is　subjected　to　a　concentrated　sulfuric　acid　modification　(SD-CMPA),　enabling　simultaneous　oxidation,　doping,　and　pore　channel　modification　in　a　single　step.　The　resulting　SD-CMPA　exhibits　a　record-breaking　maximum　adsorption　capacity　for　Hg2+,　reaching　as　high　as　1720　mg·g−1,　as　well　as　a　benchmark　distribution　coefficient　of　2.5　×　108　mL·g−1.　Moreover,　it　demonstrates　robust　reusability,　retaining　over　96%　of　its　adsorption　capacity　for　at　least　six　cycles.　These　remarkable　features　enable　the　achievement　of　ultra-deep-water　purification　to　0.452　ppb　in　an　effective　manner.　The　impressive　performance　of　SD-CMPA　can　be　attributed　to　the　abundance　of　nitrogen-containing　groups,　particularly　the　tertiary　amine　nitrogen　in　the　material　skeleton,　as　supported　by　X-ray　photoelectron　spectroscopy　and　density　functional　theory　calculations.　The　results　presented　in　this　study　demonstrate　the　exceptional　potential　of　SD-CMPA　for　high-performance　environmental　remediation.　©　2023　Elsevier　B.V.