The 21-year-old beat Thailand's Tawin Hanprab 6-4 in the final.
Luisito Pie of the Dominican Republic and South Korea's Kim Tae-hun won the bronze medals.
Kim So-hui won gold in the women's -49kg final. The South Korean defeated Tijana Bogdanovic of Serbia 7-6 in a thrilling contest.
Patimat Abakarova of Azerbaijan and Thailand's Panipak Wongpattanakit took the bronze medals.
Zhao Shuai won China's 19th gold medal of the Rio Games by taking the men's -58kg Olympic taekwondo title on Wednesday.