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The 15-year-old from Blenheim joins the previously announced line-up of Fat Freddy's Drop, supergroup Anika Moa, Boh Runga and Hollie Smith, and the Adults, featuring Jon Toogood (Shihad) and Julia Deans (Fur Patrol).
The 17-date national tour starts on February 2 at Ascension Wine Estate, Matakana, and ends on March 3 at Mystery Creek, Hamilton.
Ms van Wel wowed the show's judges and won the hearts and votes of the New Zealand public with her original compositions and poignant performances.
She released her first single, Where Do You Find Love, in December, which debuted at No 3 on the New Zealand singles chart and certified gold. She is now recording her debut album, which will be released in March.
Tickets for all shows can be bought from the winery tour website and Ticketmaster. One child under 12 will be given free admittance when accompanied by one adult ticket holder.