Abstract: The present invention relates to a card-reading device and a method for using the card-reading device to access a memory card, the card-reading device comprises: a central processing unit; at least one connecting unit; at least two interface unit, comprising a first interface unit connecting to the central unit and the connecting unit, and a second interface unit connecting to the central processing unit; and at least one accommodating unit, adapted for accommodating an external memory card. Moreover, through the method, a first electronic device or a second electronic device is able to access the memory card accommodated by the card-reading device.