Disclosed are a wearable device and a smart watch. A printed circuit board (PCB) is provided in the wearable device. An antenna and an extension component for extending a reference ground of the antenna are assembled on the PCB board, the extension component being disposed outside the PCB board, and being connected to the PCB board by using a metal connector. A first connection end of the metal connector is connected to the PCB board, and a second connection end of the metal connector is connected to the extension component. The technical solutions provided in the present invention can overcome the shortcomings of low transmit power of an antenna and poor receiving sensitivity of the antenna in a current wearable device.