The present invention relates to a method for making an antibacterial metal ion and a use thereof. It focuses on nano-metal powders being heated and discharged in sequence in vacuum, so that the nano-metal powders can be ionized into metal ions having an efficacy in sterilization of bacteria. The antibacterial metal ions enable to be applied in plastic, rubber, textile fibers, leather, metal, paint, dye or cosmetics.本發明係有關於一種滅菌金屬離子之製造方法及滅菌金屬離子的用途,係將奈米金屬粉末於真空環境下依序進行加熱、放電處理,使奈米金屬粉末被離子化而成金屬離子,而具有滅菌效果。該滅菌金屬離子可用於與塑膠、橡膠、紡織纖維、皮革、金屬、漆、顏料、染料或化妝品其中之一結合。(S1)...步驟一(S2)...步驟二(S3)...步驟三(S4)...步驟四(S5)...步驟五(S6)...步驟六