The nanosilver has been widely explored for being used as a powerful antibacterial agent in medical healthcare, electronic and household products due to its much stronger antimicrobial performance than conventional silver compounds. Meanwhile, the increasing exposure of nanosilver raises the serious concern with impacts upon the health, safety, and environment of the nanosilver-containing products. In the development of nanosilver-containing products, the bio-safety, necessity and effectiveness in clinical practices, and standardization and regulation should be carefully considered. In this article, the antimicrobial mechanism and the research progress in nanosilver toxicology was introduced. The standardization for physicochemical characterization and safety evaluation for nanomaterials as well as the regulation was addressed.