The invention discloses a smart watch, which comprises: a dial (10), a first and a second strap (20, 24), connected respectively to both sides of the dial (10), a main display (12) disposed on a front of the dial (10), a first secondary display (13) disposed on the end of the first strap (20) connected to the dial (10), and a second secondary display (14) disposed on the end of the second strap (24) and connected to the dial (10) to increase the display area of the smart watch to achieve complex human machine interaction to satisfy various demands for display by the users. By using monolithic manufacturing method, the invention achieves reducing the number of control circuit and cost. The present invention provides a multiple numerical operation method for smart watch is easy to operate and can enhance user experience.