In recent years, Ag nanowire-based transparent electrodes have received extensive attention as an alternative to indium tin oxide (ITO) owing to their excellent electrical conductivity and excellent toughness. They are used in a variety of electronic devices, such as touch screens, organic solar energy batteries, monitors, etc. However, in the application of transparent electrodes, low haze, and hence the poor conductivity arising from low aspect ratio Ag nanowires limit their usage, and hence, it is of urgency to increase the aspect ratio of these wires. In the investigation, Ag nanowires were prepared by a one-step polyol method, and the effects of mixed poly (vinylpyrrolidone) (PVP) with different molecular weights on the coating and growth process were investigated. During the growth process, the coating of the mixed molecular weight PVP on the surface of Ag nanowires allows them to grow in a single direction while reducing their width, thereby increasing the aspect ratio. The outcome of study demonstrates that the re-nucleation point of the PVP system is smaller than that of the single-molecular-weight PVP system, and the aspect ratio of Ag nanowires is higher. The molecular weights of 1 300 000 and 58 000 are fused by a weight ratio of 2∶1, and at this point, the formed Ag nanowires possessed the smallest width and the longest length to display a higher aspect ratio of up to 1 200 or more.