The present invention relates to a smart buckle for a wrist watch and, more specifically, to a buckle (100) for a wrist watch capable of connecting wrist bands (2)(3) by being connected to two end units of the wrist bands (2)(3) which are connected to both sides of the wrist watch (1), respectively. The buckle (100) comprises: a connector (110) which is connected to the two end units of the wrist bands (2)(3)； and a smart body (120) which is positioned in the connector (110). The smart body (120) includes: a controlling unit (121) a short range transmitting/receiving unit (122) which is electrically connected to the controlling unit (121), and transmits/receives signals to a smartphone； a vibrating unit (123) which is electrically connected to the controlling unit (121)； an LED displaying unit (124) which is electrically connected to the controlling unit (121), and includes an LED light lamp (124a) which is exposed to the outside of the smart body (120)； a message receiving unit (125) which is electrically connected to the controlling unit (121), and informs a state of enabling the smartphone to receive a text message or an SNS message by using the short range transmitting/receiving unit (122) with vibration of the vibrating unit (123) or the LED light lamp (124a) of the LED displaying unit (124)； a power supplying unit (126) which is electrically connected to the controlling unit (121)； and a charging unit (127) which is electrically connected to the power supplying unit (126).본 발명은 손목시계용 스마트 버클이 개시되는 것으로, 손목시계(1)의 양측에 각각 연결되는 2개의 손목밴드(2)(3) 끝단부에 각각 연결되어 손목밴드(2)(3)를 체결하는 손목시계용 버클(100)에 있어서, 상기 버클(100)은, 상기 2개의 손목밴드(2)(3) 끝단부에 각각 연결되는 체결체(110)와； 상기 체결체(110)에 구비되는 스마트본체(120)로 이루어지되, 스마트본체(120)에는, 제어부(121)와； 상기 제어부(121)와 전기적으로 연결되고 스마트폰과 송수신하는 근거리 송수신부(122)와； 상기 제어부(121)와 전기적으로 연결되는 진동부(123)와； 상기 제어부(121)와 전기적으로 연결되고 상기 스마트본체(120)의 외부측으로 노출되는 LED표시등(124a)을 갖는 LED표시부(124)와； 상기 제어부(121)와 전기적으로 연결되어 상기 근거리 송수신부(122)에 의해 문자메시지나 SNS메시지가 스마트폰에 수신될 때 이를 상기 진동부(123)에 의한 진동 또는
