The invention relates to a remnant electric charge releasing device of a converter station valve hall. According to the remnant electric charge releasing device, a bus where a valve hall high-voltage polarline point is located and a bus where a valve hall low-voltage polarline point is located are respectively provided with a ground cutter in the single converter station valve hall. The remnant electric charge releasing device is characterized in that a ground cutter is arranged on a connecting bus between an A-phase converter transformer valve side terminal and a C-phase converter transformer valve side terminal of a Y-delta converter transformer set, and a ground cutter is arranged on a bus where a neutral point terminal of a Y-Y converter transformer set is located. According to the remnant electric charge releasing device, eight ground cutters in a valve hall in the prior art are reduced to four ground cutters, and the total engineering investment is saved. A side wall type is adopted in the ground cutters arranged in the Y-Y converter transformer set and the Y-delta converter transformer set, accidents of operating personnel when maintaining and detecting are carried out in the valve hall are avoided and the valve hall electric arrangement is optimized while the needed electric distance and structural requirements are met. The remnant electric charge releasing device can be widely applied to the field of high-voltage and direct-current transmission.