An electronic tag having a wristband includes a base defining at least one receiving notch, a radio frequency identification element received in the base, at least one connecting element connecting the radio frequency identification element, a locking module captured in the receiving notch and resisting the connecting element, and a wristband mounted in the locking module. The radio frequency identification element, the connecting element, the locking module, and the wristband cooperate to form a closed loop circuit to achieve an electric induction. When the wristband is detached from the locking module, the closed loop circuit is cut and the radio frequency identification element sends out an alarm.