Line 4 is an east-west line on the Nanjing Metro, running from Xianlinhu to Longjiang.

It consists of 18 stations and spans a total of 33.75 km (20.97 mi).

The line color is purple, and it first opened on January 18, 2017.

[2] routes The second phase of the line will extended it to Zhenzhuquandong station.

[3][4] A further extension to Yujiaying is under planning.