Abstract: A device and a method for detecting the opening of a vessel are disclosed, the device includes: a control circuit which stores and provides the identification data, an antenna which is connected to the control circuit forms a circuit loop together with the control circuit, and the antenna has an extending unit; the antenna provides the communication channel to the control circuit; the antenna and its extending unit and the control circuit are attached to the vessel, when the vessel is open, the antenna, the circuit loop or the control circuit is destroyed, thus the control circuit cannot provide the identification data. With the device and method, the vessel, such as container, is prevented from being illegally opened or replaced without knowing in the transporting or keeping process.