A wearable power supply , comprising a control module , a battery ; and a first charge module , a second charge module , a communication module , and a remaining capacity computation module , which are connected to the control module , wherein the first charge module comprises a driver and a first interface , wherein the driver is connected to the control module , the first interface , and the battery , respectively, and the first interface is configured to connect to an external energy source which charges the battery through the first interface ; the second charge module comprises a voltage boost driver and a second interface , wherein the voltage boost driver is connected to the control module , the battery , and the second interface , respectively, the second interface is configured to electrically connect to a terminal through contact pins to charge the terminal, and the voltage boost driver is configured to step up an output voltage of the battery to a required rated voltage of the terminal; the remaining capacity computation module is configured to adjust a remaining capacity value of the battery in real time based on a discharging curve of the battery ; and the communication module is configured to connect to the terminal through the contact pins and to send the adjusted remaining capacity value from the remaining capacity computation module to the terminal to display; characterized in that : the terminal is a smart watch; the wearable power supply further comprises a magnet, and is stacked and secured onto a back of the terminal to form a whole via the attraction of the magnet and an enclosure of the terminal; and the wearable power supply is of a cylindrical shape, and a height of the wearable power supply is smaller than 1mm. the first charge module comprises a driver and a first interface , wherein the driver is connected to the control module , the first interface , and the battery , respectively, and the first interface is configured to connect to an external energy source which charges the battery through the first interface ; the second charge module comprises a voltage boost driver and a second interface , wherein the voltage boost driver is connected to the control module , the battery , and the second interface , respectively, the second interface is configured to electrically connect to a terminal through contact pins to charge the terminal, and the voltage boost driver is configured to step up an output voltage of the battery to a required rated voltage of the terminal; the remaining capacity computation module is configured to adjust a remaining capacity value of the battery in real time based on a discharging curve of the battery ; and the communication module is configured to connect to the terminal through the contact pins and to send the adjusted remaining capacity value from the remaining capacity computation module to the terminal to display; characterized in that : the terminal is a smart watch; the wearable power supply further comprises a magnet, and is stacked and secured onto a back of the terminal to form a whole via the attraction of the magnet and an enclosure of the terminal; and the wearable power supply is of a cylindrical shape, and a height of the wearable power supply is smaller than 1mm. the terminal is a smart watch; the wearable power supply further comprises a magnet, and is stacked and secured onto a back of the terminal to form a whole via the attraction of the magnet and an enclosure of the terminal; and the wearable power supply is of a cylindrical shape, and a height of the wearable power supply is smaller than 1mm. <EOS>