Abstract: A multi-functional cable is provided, one side of the cable includes a first transmission port connected to a charger or a personal computer and used to transmit the electric power or the data. The other side of the cable includes a second transmission port and a third transmission port connect with two portable devices to provide the charging current to the portable devices respectively, wherein the second transmission port not only transmit the electric power to the portable device but also provides the function of data transmission between the portable device and the personal computer. It can achieve the purpose that provides the charging current simultaneously to two portable devices from a single charger or a USB port of the personal computer and also support the data transmission at the same time.