60Co　is　widely　utilized　in　industries　and　can　emit　high　gamma　energy.　The　removal　radioactive　60Co　in　trace　concentration　from　wastewater　is　important　for　human　health　and　environment　protection.　Here,　we　designed　a　biomass　base　membrane　with　phenol　hydroxyl-amino　group　for　ultraselective　enriching　of　trace　concentration　of　Co2+　from　radioactive　wastewater.　This　novel　membrane　adsorbent　(PAM–PBWT),　that　is,　the　immobilized　black　wattle　tannin　(BWT)　modified　with　polyethylenimine　onto　the　polyamide　microporous　membrane　(PAM),　utilizes　phenolic　hydroxyl　and　amino　group　can　form　a　coordinated　coordination　with　Co2+,　exhibiting　high　selectivity　adsorption　to　Co2+　even　in　the　presence　of　other　ions.　A　maximal　adsorption　capacity　(0.39　mmol　g−1)　was　reached　at　pH　8.0　and　323　K.　The　continuous　adsorption　experiments　showed　that　the　PAM–PBWT　can　enrich　the　trace　concentration　of　Co2+　(60　ng　L−1)　from　radioactive　wastewater　in　the　presence　of　other　coexisting　ions　(K+,　Ca2+,　Na+,　Mg2+,　Zn2+,　Mn2+,　Fe3+).　Moreover,　the　processing　capacity　of　three-layer　PAM–PBWT　for　simulated　60Co-containing　wastewater　can　reach　80　L　m−2.　Notably,　PAM–PBWT　can　be　easily　regenerated　with　0.1　M　HNO3　without　the　loss　of　adsorption　capacity.　Our　work　might　introduce　a　new　strategy　for　realizing　selectivity　adsorption　of　trace　concentration　irradiation　contaminants　from　radioactive　wastewater.　©　2021　Elsevier　B.V.