The invention provides a device and a method for starting the charging of an island converter station for a flexible direct current transmission system. The configuration of the converter station comprises the step of starting a charging device, wherein the main circuit of the device is composed of a starting resistor and a by-pass switch connected in parallel, and a starting device and a line switch are serially connected to the direct current side of the converter station; the charging method comprises the following steps: remaining the by-pass switch to be disconnected, closing the line switch for uncontrollable charging, and determining whether the controllable charging is finished based on charging current and direct current voltage value; after the controllable charging is finished,entering into controllable active charging, and determining whether the controllable active charging is finished based on the charging current and direct current voltage value; and cutting off the starting resistor to finish charging. Through the technical scheme provided by the invention, smooth non-impact charging starting for the island converter station can be completed under the condition that the protection of the flexible direct current transmission system is not triggered.