In the present paper, AgNO3 and KI were used as raw materials synthesize silver iodide nanowire bundles in the condition of nonionic surfactant polyethylene glycol (PEG-400) at room temperature. XRD, TEM and SEM techniques were used to characterize the silver iodide structure and morphology. The results indicated that the product was one-dimensional silver iodide nanowire bundles with diameters of 80~100 nm and lengths of 20 μm, and the length-diameter ratio was greater than 200. In the forming process of silver iodide nanowire bundles, PEG-400 surfactant was used as soft template agent, which induced the product nanocrystalline along a particular direction and directional orderly growth so as to generate nanowire bundles. This method with a simple operation and low cost eliminated the influence of water on the reaction process.