Automatic warning bottle plug puncture needle

The utility model discloses an automatic warning bottle plug puncture needle which comprises a hollow needle body tube. The utility model has the essential proposal that the wall of an inner cavity of the hollow needle body tube is provided with a pair of electromagnetic contactors; float electromagnetic contact heads are arranged on the electromagnetic contactors, and the sizes of the float electromagnetic contact heads correspond to that of the electromagnetic contactors; an inserting hole of an external connected alarm is arranged under the hollow needle body tube; a conducting wire communicates the external connected alarm with the electromagnetic contactors by the inserting hole. The utility model has the advantages of reasonable structural design, simple manufacture and convenient use. When in transfusion, a patient does not need to be monitored by a special person and the utility model can remind a nursing person to replace liquid in time and can be widely used for clinic.