The invention relates to a radio-frequency sub tag, in particular to an anti-defense wristband type electronic tag. The electronic tag comprises a body, a wristband and a wristband buckle; a radio-frequency transceiving control module is arranged in the body; a conductive circuit and a micro button switch are arranged in the wristband; a mechanical structure for fixing the wristband and triggering the micro button switch is arranged in the wristband buckle; and the conductive circuit is connected to the input/output (I/O) port of the radio-frequency transceiving control module through the micro button switch. The radio-frequency transceiving control module perceives the on-off change of the conductive circuit to judge the state of the wristband; and when a wearer privately detaches the wristband buckle, shears or detaches the wristband, the radio-frequency transceiving control module emits wireless alarm signals so that a control center takes measures in time.