In　this　work,　multifunctional　sulfonated　polystyrene/polyaniline/silver　(SPS/PANI/Ag)　nanocomposites　are　prepared　through　using　sulfonated　polystyrene　(SPS)　spheres　as　templates　and　utilizing　polyvinylpyrrolidone　(PVP)　as　reducing　agent　and　stabilizing　agent.　Our　method　is　an　environmentally　friendly　method　because　no　toxic　reagents　are　added　during　the　preparation　process.　Fourier　transform　infrared　spectrum　(FTIR),　field　emission　scanning　electron　microscopy　(FESEM),　and　energy　disperse　spectroscopy　(EDX)　results　confirmed　the　formation　of　PS　spheres,　SPS　spheres,　SPS/PANI　nanocomposites,　and　SPS/PANI/Ag　nanocomposites.　Powder　X-ray　diffraction　(XRD)　patterns　indicate　that　the　obtained　Ag　nanoparticles　are　crystalline.　Solubilities　measurements　show　that　SPS/PANI/Ag　nanocomposites　have　improved　solubilities　when　compared　to　pure　PANI　in　common　organic　solvents　and　deionized　water.　Antibacterial　studies　show　that　SPS/PANI/Ag　nanocomposites　can　greatly　inhibit　the　growth　of　Escherichia　coli　and　Staphylococcus　aureus.　Anticorrosion　studies　show　that　the　incorporation　of　SPS/PANI/Ag　nanocomposites　in　waterborne　alkyd　resin　can　greatly　promote　the　anticorrosive　efficiency　of　waterborne　alkyd　resin.