The Daxing Line of the Beijing Subway (simplified Chinese: 北京地铁大兴线; traditional Chinese: 北京地鐵大興線; pinyin: Běijīng Dìtiě Dàxīng Xiàn) is a rapid transit line that connects the southern Daxing District of the city with the subway network.

It extends Line 4 south from its southern terminus at Gongyixiqiao, on the 4th Ring Road in Fengtai District, to Tian'gongyuan, beyond the 6th Ring Road in Daxing District.

[3] Initially, the Daxing line was planned to have 4 ground stations.

However, due to lack of space, only Xihongmen was built above the surface.

[6] Full-scale construction began in 2007 and the line was opened on 30 December 2010, 14:00 local time.