The student told Chinese media last month that Wu had lured her into having sex when she was 17 after plying her with liquor. A police statement last month said the student was invited by Wu’s team to his house for casting in music videos.
Wu has previously denied the accusation and was not immediately contactable on Sunday.
Wu’s studio did not immediately respond to a request for comment. His law firm did not answer calls. The Canadian embassy in Beijing did not immediately respond to an e-mailed request for comment.
It was not immediately clear whether Wu’s arrest was linked to the student who made the accusations in July.
Wu made his Hollywood debut in the 2017 sci-fi film “XXX: Return of Xander Cage” and was previously a member of K-pop group EXO.
At least a dozen brands including Porsche and Bvlgari had cut ties with Wu after the accusation, which have caused a social media storm in China.
Chinese state media have indicated that Wu’s celebrity status and foreign citizenship are unlikely to help his case.
“Foreign nationality is not a talisman, no matter how famous he is, there is no immunity. Whoever breaks the law will be punished by law,” said the Communist Party-owned People’s Daily on a social media posting on Saturday evening that referred to the case.