The invention relates to a flexible direct current transmission and alternating current resistance starting device which comprises a barrier box body, a bypass switch and a plurality of supporting insulators, wherein an alternating current power system is connected in parallel with one end of each of the barrier box body and the bypass switch by an alternating current circuit breaker; the other end of each of the barrier box body and the bypass switch is connected in parallel with a flexible direct current transmission system converter station; the supporting insulators used for supporting the barrier box body are fixedly arranged at the bottom of the barrier box body; an insulating porcelain core is fixedly arranged in the barrier box body; a resistance module is arranged on the insulating porcelain core in a winding manner; and an input end and an output end of the resistance module penetrate through wall sleeves arranged on the two sides of the barrier box body respectively, and then are connected with the alternating current circuit breaker and the flexible direct current transmission system converter station. The starting device can ensure safe starting and reliable operation of an MMC (Modular Multilevel Converter) in a flexible direct current transmission system, and can be widely applied in the field of flexible direct current transmission.