Wearing a sparkling blue gown, Yu Wenxia waved to the audience in the Dongsheng Stadium in Ordos, located in China's Inner Mongolia Autonomous Region.
Organizers said Yu beat out 115 contestants, a record, in the highly publicized annual international beauty pageant.
China also won the Miss World title in 2007, when model Zhang Zilin took the crown.
"I love to smile and I like music," Yu said in a video posted on the pageant's website, in which she talks about her study of Chinese folk music.
Sophie Moulds, a 19-year-old business student from Wales, took second place. Jessica Kahawaty, 23, a law student from Australia, was third.
(Reporting by Lily Kuo; Editing by Mary Wisniewski and Xavier Briand)
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