The disclosure provides a self-powered sheet which is configured to absorb and to be applied on a human skin. The self-powered sheet includes a base layer and a plurality of electrically conductive inks. The base layer is configured to absorb the liquid and adapted to be applied on the human skin. The base layer has a contact surface. The electrically conductive inks are disposed on the contact surface of the base layer. Each of the electrically conductive inks has a plurality of first electrodes and a plurality of second electrodes. When each of the first electrodes and each of the second electrodes are soaked in the liquid, an electrical potential difference between one of the plurality of first electrodes and one of the plurality of second electrodes generate a current in the human skin.
