The DJ, whose real name is Norman Cook, will be joined on the festival line-up by the acclaimed English singer-songwriter Jess Glynne.
The annual family-friendly festival takes place at Lulworth Castle from 28 to 31 July and has an outer space theme. Other acts include children’s entertainers Dick and Dom.
Organised by Rob Da Bank, it is known as the “little sister” of Bestival, which is held on the Isle of Wight.
Headline acts in previous years have included Blondie, Bassment Jaxx and Mark Ronson