The present invention provides a smart body temperature checking device to solve existing problems. The smart body temperature checking device is simply attached to infant&prime；s or child&prime；s wrists, under an arm, or just behind an ear to continuously check the child&prime；s body temperature in real time and transmits body temperature information to a guardian&prime；s smartphone via Bluetooth or a wireless network to enable the guardian to check the child&prime；s body temperature continuously in real time. As a result, the smart body temperature checking device may eliminate inconvenience of checking the body temperature and continuously check whether the body temperature changes correctly in real time, thereby enabling a prompt response to a change in the body temperature. In addition, since the body temperature information is transmitted via a wireless network, it is possible for the guardian to check the state of the change in the body temperature of a child even when the guardian is not with the child. Moreover, data of the change in the body temperature of the child over time can be displayed in a graph form or the like, so it is possible to not only make it easier for the guardian to confirm the child&prime；s body temperature accurately, but also to contribute to correct treatment by providing the data to a doctor during an office visit. The smart body temperature checking device comprises an attachment part (100) having a wristwatch or bracelet shape to be put on a wrist of a user and a main body part (200), wherein the attachment part (100) includes a body temperature sensing unit (110) attached to an inner side of the attachment part (100), and the main body part (200) includes a display unit (210), a light emitting display unit (220), a beep notification unit (230), a vibration generation unit (240), a user setting button (250), first and second memories (260, 270), a control unit (280), and an interface unit (300).COPYRIGHT KIPO 2018본 발명은 상기한 문제점을 개선
