A　superhydrophilic　and　antibacterial　surface　with　silver　nanoparticles　(AgNPs)　was　fabricated　on　the　blend　membranes　of　poly(vinylidene　fluoride)　(PVDF)　and　poly(styrene-co-maleic　anhydride)　(SMA).　The　PVDF/SMA　blend　membranes　were　surface-modified　firstly　by　coating　polydopamine　(PDA)　in　aqueous　solution　for　24 h.　Subsequently,　AgNPs　were　immobilized　in　situ.　Lastly,　the　AgNP-loaded　membranes　were　second　coating　PDA.　Scanning　electronic　microscopy　(SEM)　was　carried　out　to　characterize　both　the　micro-　and　nanoscale　hierarchical　structures.　The　results　of　X-ray　photoelectron　spectroscopy　(XPS)　indicated　that　metallic　silver　was　formed　and　more　Ag　loaded　might　be　apt　to　deposit　more　PDA　during　the　second　coating　PDA　procedure.　The　membrane　surface　hydrophilicity　was　characterized　by　water　contact　angle　measurement;　AgNPs　and　PDA　had　provided　an　excellent　hydrophilicity.　Meanwhile,　AgNPs　imparted　outstanding　antibacterial　activity　to　the　modified　membranes　which　was　confirmed　by　halo　zone　test.　All　of　the　results　demonstrated　that　the　modified　surface　possessed　superhydrophilic　and　excellent　antibacterial　properties.　©　2017,　Springer-Verlag　GmbH　Germany.