Transfusion extravasation alarm

The invention discloses an infusion solution leak alarm which comprises an elastic band, a flexible strap and fasteners and is characterized in that the flexible strap under the elastic band is internally provided with a buzzer, an electric chip, a cell and a touch switch, wherein, the electric chip, the cell and the touch switch are connected in series; an insulator is arranged on the flexible strap and both ends of the flexible strap are provided with fasteners. Before use, the insulator on the flexible strap is inserted in the middle of the touch switch; and when in use, the infusion solution leak alarm is covered on an infusion needle and the fasteners are buckled according the condition of an infusion part. Once the infusion solution leaks and partial skin swells subsequently, the insulator on the flexible band is then be separated from the touch switch which is then electrified and the buzzer gives an alarm as a result. The infusion solution leak alarm has the advantages that since the alarm is fixed on