A service platform utilizing an electronic paper device for financial institutions, comprising: an option input device, used for sensing an entry operation and outputting a financial business option signal accordingly; a control unit, having an option input interface, a display interface, a host interface, and a slips storage unit, wherein the option input interface is used to receive the financial business option signal, the host interface is used to communicate with a financial institution host, the slips storage unit is used to store financial business slips; and an electronic paper device, having a touch input function, coupled to the display interface to display one financial business slip for related information input by a touch pen, or transmit the related information through the control unit to the financial institution host, or display an informing message sent from the financial institution host through the control unit.