The invention relates to a nanosilver bacteriostatic spray, wherein the components of the nanosilver bacteriostatic spray are as follows: a nanosilver ion colloidal solution, a stabilizing agent, an osmotic pressure regulator, a pH regulator, a humectant and a foaming agent. The nanosilver bacteriostatic spray provided by the invention takes nitrate-free silver ion colloid as a bacteriostatic component and has the advantages of being good in bacteriostatic effect, stable in quality, fast in bacteriostasis and free from irritation and the like, and has stronger inbibitional effects on escherichia coli, staphylococcus aureus, candida albicans, pseudomonas aeruginosa, haemophilus influenza, pneumococcus and group B streptococcus and the like, so that the nanosilver bacteriostatic spray is suitable for the diseases with bacterial and fungal infection in the nasal cavities and female vaginas and the like. According to the nanosilver bacteriostatic spray, the preparation method is simple, and the nanosilver bacteriostatic spray is convenient to use and significant in efficacy.