A　silver　nanoparticles-poly(carboxybetaine　methacrylate)　(AgNPs-PCBMA)　nanocomposite　was　prepared　on　poly(vinylidene　fluoride)　(PVDF)　membrane　surface　to　improve　its　hydrophilicity　and　antifouling　properties.　Firstly,　the　PVDF　membranes　were　grafted　by　PCBMA　via　physisorbed　free　radical　grafting　technique.　Then　Ag+　coordinated　to　the　carbonyl　group　on　PCBMA　and　subsequently　was　reduced　to　silver　nanoparticles.　The　hydrophilicity　of　the　PVDF-g-PCBMA/Ag　membrane　was　enhanced　with　the　increasing　fixed　degree　(FD)　of　AgNPs,　and　the　original　water　contact　angle　of　membrane　was　reduced　to　33.97°.　Additionally,　water　flux　recovery　ratio　(FRR)　and　bovine　serum　albumin　(BSA)　rejection　ratio　of　PVDF-g-PCBMA/AgNPs　membrane　were　improved　from　52%　to　93.32%　and　28.12%　to　91.12%,　respectively.　Further,　the　PVDF-g-PCBMA/AgNPs　membranes　exhibited　the　more　pronounced　inhibition　zone.　The　study　demonstrated　that　compared　with　pure　AgNPs　or　the　PCBMA　polymer　brush,　the　synergistic　effect　of　PCBMA　and　AgNPs　made　PVDF　membranes　have　better　hydrophilicity　and　anti-bacterial　performances.　©　2017,　Chinese　Chemical　Society,　Institute　of　Chemistry,　Chinese　Academy　of　Sciences　and　Springer-Verlag　Berlin　Heidelberg.