A wearable device (100), comprising a main body (1) and a detection electrode (21). The main body (1) comprises an electrocardiosignal acquisition circuit (11), and an inner electrode (12) and an outer electrode (13) which are electrically connected to the electrocardiosignal acquisition circuit (11)； the inner electrode (12) is used for acquiring an electric potential signal of a first wearing position (200)； the outer electrode (13) is used for acquiring an electric potential signal of a non-wearing position (300)； the detection electrode (21) can move relative to the main body (1)； the detection electrode (21) is used for being electrically connected to the electrocardiosignal acquisition circuit (11) and acquiring an electric potential signal of a second wearing position (400)； the non-wearing position (300) and the second wearing position (400) are both different from the first wearing position (200). The wearable device (100) can measure electrocardiographic data in time.
