She thrilled her hometown crowd at the Atos Markham Pan Am/Parapan Am Centre with a 2-0 victory over fellow Canadian Rachel Honderich in today's women's badminton final.
Li, who won gold four years ago at the 2011 Games in Guadalajara, Mexico, defeated Honderich 21-15, 21-9.
Li and Honderich teamed up together to win doubles bronze earlier in the week.
Canada's Toby Ng and Alex Bruce settled for silver in the mixed doubles final. They dropped a 21-9, 21-23, 21-12 decision to Americans Phillip Chew and Jamie Subandhi.
In the men's singles final, Kevin Cordon of Guatemala beat Canada's Andrew d'Souza 21-13, 21-14.