A sanitary isolating device applied to a wash basin or a bathtub, comprising an isolating assembly (1) and a fixing assembly (2). The isolating assembly (1) comprises an isolating film (11). The isolating film (11) is provided with a drainer (12). The fixing assembly (2) comprises a connecting piece (21). A suction cup (22) is provided on one side of the connecting piece (21), and a fixing device of the isolating film is provided on the other side of the connecting piece (21). The sanitary isolating device can be deformed at will based on different actual places to be fixed at a required position to effectively isolate a cleaned object from a public water apparatus to reduce the spreading of bacteria.