This　study　proposes　an　effective　route　for　synthesis　of　three-dimensional　(3D)　flower-like,　Ag-coated　magnetic　(Fe3O4@SiO2@Ag)　microcomposites　with　well-controlled　sizes　and　shapes.　The　fabricated　microflowers　consist　of　a　micro-scale　Fe3O4@SiO2　core,　which　provides　sufficient　magnetic　response　properties　and　good　dispersibility,　and　a　highly-branched　Ag　shell,　which　is　characterized　by　a　large　specific　surface　area　and　multidimensional　catalytically　active　sites.　The　Ag　seeds　on　the　Fe3O4@SiO2　microspheres　play　a　key　role　in　the　formation　of　a　flower-like　structure　and　can　be　produced　massively　and　reproducibly　through　electroless　plating.　Furthermore,　the　surface　morphologies　of　the　microcomposites　can　be　well　controlled　by　changing　the　experimental　parameters.　Four　kinds　of　composites　with　well-tuned　surface　morphologies　were　synthesized　to　systematically　investigate　the　effect　of　surface　nanostructures　on　the　performance　of　catalytic　reduction　reactions.　Highly-branched　microflowers　exhibit　significantly　higher　catalytic　activity　than　non-branched　or　little-branched　structures　toward　the　reduction　of　4-nitrophenol　and　methylene　blue.　The　flower-like　catalysts,　which　exhibit　excellent　magnetic　properties,　can　be　easily　recycled　and　retain　＞　93%　conversion　for　at　least　six　cycles.　Hence,　Fe3O　(4)@SiO2@Ag　microflowers　can　be　efficient　and　recyclable　catalysts　for　various　catalytic　reductions.