Tracks by the smash-hit Swedish group are being lined up especially for fan Kate.
A Royal source said: "It'll be a wedding disco like those enjoyed by millions of other happy families and friends up and down the country."
The DJ is being given a list of special requests by club entrepreneur Guy Pelly, best man Prince Harry's closest friend.
There will be a 1980s theme for the knees-up with hits by Spandau Ballet, Duran Duran and Culture Club blaring out for Wills - as well as the Abba classics for Kate.
The decision would have thrilled Wills' late mum Princess Diana, who was a huge fan of the '80s sounds.
ROYAL ABBA TOP 10
1 - Ma'amma Mia
2 - Dancing Queen
3 - Knowing One, Knowing You
4 - The Windsors Take It All
5 - (I Don't Carry) Money, Money, Money
6 - Take A Chance On Bea
7 - Super Trooping (The Colour)
8 - Thank You For The Monarch
9 - One Does, One Does, One Does, One Does, One Does