Smart wearable device

The present invention discloses a smart wearable device comprising a connecting unit (1), a first sensory module (2), a second sensory module (3) and an extending unit (4), and the smart wearable device is maintained on a wearer via a plurality of contact pad sets (6). The connecting unit comprises a connecting belt (11), a first positioning groove (12), a first positioning unit (13), a second positioning groove (14) and a second positioning unit (15). The connecting belt has a first end (111) and a second end (112), and the first end forms a paralleled line or a perpendicular line with the second end. The first sensory module comprises a first sensory unit (21), and the second sensory module comprises a second sensory unit (31). The extending unit comprises an extending belt (41), a first extending zone, a second extending zone, a first fastening unit and a second fastening unit. When the connecting belt connects to the extending belt, the extending belt lies upon the perpendicular line, and the first fastening unit connects to a first contact pad set so that the first extending zone is kept on the upper limb of the wearer, and the second fastening unit connects the first sensory unit. The first positioning unit has a first (131), second (132) and third positioning hole (133) disposed around a first set point (A1). The particular arrangement of positioning units allow multiple measurement sensors to be equipped at approximately the same location to accurately record muscle activity in simple one unit.