Purifying　water　contaminated　with　emulsified　oil　via　forward　osmosis　(FO)　is　still　plagued　by　low　water　recovery　efficiency　and　poor　fouling　resistance　of　membrane.　Herein　we　design　a　series　of　arginine-copper　complexes　to　construct　antifouling　FO　membranes　from　a　polyamide　membrane　(PA-M)　for　oily　water　reclamation.　A　modification　layer　abundant　in　Cu2+　and　guanidino　is　formed　on　the　PA　selective　surface.　It　endows　the　membranes　with　desired　structural　and　physicochemical　properties　that　benefit　the　FO　separation.　The　membrane　functionalized　with　copper　arginine　sulfate　(CAS-M)　outperforms　PA-M　with　water　fluxes　enhanced　by　151　%　against　DI　water.　CAS-M　also　achieves　higher　oil-water　separation　efficiency　with　the　water　recovery　rate　increased　by　94　%　compared　to　that　of　PA-M　when　3000　ppm　emulsified　oil　as　the　feed.　Remarkably,　CAS-M　exhibits　excellent　antifouling　and　antibacterial　performance　with　a　98　%　antibacterial　rate　and　easier　cleaning　property　after　being　fouled.　Favorable　physicochemical　and　structural　characteristics　as　well　as　advantageous　water　transfer　properties　are　the　major　benefits　of　CAS-M.　This　makes　CAS-M　outperform　PA-M　and　other　recently　reported　FO　membranes　with　exceptional　water　permeability　and　antifouling　ability.　This　study　demonstrates　an　eco-friendly　protocol　to　develop　antifouling　and　antibacterial　FO　membrane　for　sustainable　oily　water　purification.　©　2024　Elsevier　B.V.