Silver medallist at the 2010 Vancouver Olympics, Li has only entered one other World Cup event since then, but she gave the home fans something to cheer on Sunday.
With a well executed program, the 30-year-old pulled off a back double-full in the final to help her to an overall score of 94.11 points for her 17th career victory and 43rd podium finish.
After a year out due to injury, USA's Ashley Caldwell took silver with a back-full, double-full in the final which left her just 0.7 points off Li.
While China's Sicun Xu completed the medal rostrum in third with reigning world champion Mengtao Xu in fourth after failing to execute a difficult jump in the final.
There was further Chinese success in the men's event as Zhongqing Liu claimed his first ever World Cup victory at the 43rd time of asking with an overall score of 127.15 points.
Compatriot Zongyang Jia was third with a score of 120.81 while Belarus' Anton Kushnir broke up the Chinese dominance with his score of 124.43 giving him silver.