The Scottish star will perform at the show on July 10 at the Grand Stadium in Shanghai. It is thought she will sing a number of classical songs as well as tracks by some of the local musicians.
It's claimed she agreed to perform on the show some time ago but the news has only just been revealed as bosses wanted to keep the signing a secret.
Boyle, 50, shot to fame when she auditioned on Britain's Got Talent in 2009.
She ended up coming second in the talent show but has gone on to become a worldwide sensation.