Zhang Di, 26, won on the basis that her appearance would most benefit from plastic surgery.
"My small eyes, flat nose and poor skin have been such a burden to me," she said.
The manager of the plastic surgery centre that will treat her promised to make her "a totally different girl" within a matter of two weeks.
More than 100 of the world's most beautiful women are in China for the finals of the Miss World contest on December 6th on Hainan Island.
Plastic surgery has become more popular in China in recent years.
