An active RFID device of 13.56MHz comprising a main body, and comprising an SE chip , an interface and an internal antenna deployed on the main body, wherein the device further comprises an RF front-end chip and the interface comprises an ISO/IEC7816 interface for operating the SE chip , characterized in that : the interface further comprises a power interface and an SPI interface for setting parameters for a register of the RF front-end chip ; the RF front-end chip is coupled to a reader antenna via the internal antenna , an external antenna , or a combination of the internal antenna and the external antenna ; in an internal antenna mode in which the RF front-end chip is connected with the internal antenna , specifically the internal antenna is connected with RF I/O pins of the RF front-end chip , in an external antenna mode in which the RF front-end chip is connected with the external antenna , specifically the external antenna is connected with RF I/O pins of the RF front-end chip ; in a combined antenna mode in which the RF front-end chip is connected with the combination of the internal antenna and the external antenna , specifically the internal antenna is firstly connected in parallel with the external antenna and then connected with RF I/O pins of the RF front-end chip , or the internal antenna is firstly connected in series with the external antenna and then connected with RF I/O pins of the RF front-end chip ; and the RF I/O pins of the RF front-end chip and both ends of the internal antenna are suspended without any connection in the external antenna mode, and the connection between the RF I/O pins of the RF front-end chip and the internal antenna is applied in the internal antenna mode or the combined antenna mode. the interface further comprises a power interface and an SPI interface for setting parameters for a register of the RF front-end chip ; the RF front-end chip is coupled to a reader antenna via the internal antenna , an external antenna , or a combination of the internal antenna and the external antenna ; in an internal antenna mode in which the RF front-end chip is connected with the internal antenna , specifically the internal antenna is connected with RF I/O pins of the RF front-end chip , in an external antenna mode in which the RF front-end chip is connected with the external antenna , specifically the external antenna is connected with RF I/O pins of the RF front-end chip ; in a combined antenna mode in which the RF front-end chip is connected with the combination of the internal antenna and the external antenna , specifically the internal antenna is firstly connected in parallel with the external antenna and then connected with RF I/O pins of the RF front-end chip , or the internal antenna is firstly connected in series with the external antenna and then connected with RF I/O pins of the RF front-end chip ; and the RF I/O pins of the RF front-end chip and both ends of the internal antenna are suspended without any connection in the external antenna mode, and the connection between the RF I/O pins of the RF front-end chip and the internal antenna is applied in the internal antenna mode or the combined antenna mode. <EOS>