AgNO3 was reduced by ethylene glycol (EG) in the presence of Pt seeds and polyvinylpyrrolidone (PVP) under microwave heating. In addition to spherical nanoparticles, single-crystalline silver nano-films, rods, and wires were produced. The relative number ratio of nanorods and nanowire to the total silver nanostructures was <14%. The formation mechanism of anisotropic silver nanostructures was discussed.