Copper　in　drinking　water　causes　a　significant　environmental　problem.　Composite　material　based　on　alginate　hydrogel　has　been　gaining　attention　in　the　field　of　Cu(II)　adsorption.　However,　alginate-based　hydrogel　exhibits　poor　mechanical　property　and　relative　low　adsorption　capacity　which　limit　their　application.　The　present　study　is　devoted　to　the　modification　of　chitosan/calcium　alginate/Fe3O4　(CAF)　hydrogel　microsphere　by　NaOH　solution　for　enhancement　of　Cu(II)　adsorption.　Results　reveal　that　modification　of　CAF　via　NaOH　solution　significantly　improves　the　mechanical　strength　and　Cu2+　adsorption　capacity　of　pristine　materials.　FTIR　and　XRD　analysis　confirms　that　CAF　and　newly　prepared　materials　(NACAF)　are　successfully　prepared.　SEM　and　EDX　are　employed　to　analyze　the　surface　morphology　and　elemental　composition,　respectively,　both　before　and　after　their　loading　with　Cu2+.　XPS　study　demonstrates　adsorption　mechanism　is　based　on　chelation　and　ion-exchange.　Compressive　stress-strain　curves　demonstrate　NACAF　has　better　mechanical　performance　than　CAF.　The　adsorption　kinetics　of　the　two　adsorbents　follow　a　pseudo-second-order　model.　The　equilibrium　data　were　best　described　by　Langmuir　isotherm　model,　and　the　estimated　maximum　equilibrium　sorption　capacity,　q(m),is　261.31　mg/g　for　the　NACAF,　which　is　larger　than　that　of　CAF　(145.39　mg/g).　Hence,　NACAF　shows　excellent　mechanical　strength　and　high　sorption　capacity　for　Cu2+.　It　has　great　potential　for　Cu(II)　removal　in　aqueous　solutions.