A preparation method of floating solution is disclosed, including the following steps: a treatment process for forming a floating solution, and a dissolution process for dissolving sea salt, wherein the content ratio of calcium ion to magnesium ion in sea salt is from 0.05 to 1. By using specific type of sea salt, the floating solution formed therefrom produces moisturizing effect.一種製備漂浮用溶液的方法,包含以下步驟:一處理步驟,形成漂浮用溶液,且包括將海鹽溶解的溶解程序。在該海鹽中鈣離子與鎂離子的含量比值範圍為0.05至1。透過使用特定的海鹽,使得由該海鹽所形成的漂浮用溶液具有保濕效果。