The festival located in a secret Cambridgeshire location have added Guillemots, Rob Da Bank and more to their line-up.
Also joining Guillemots, who we interviewed this week, are The Bees, Mylo and Boxer Rebellion.
The festival takes place from 21 to 24 July with Mystery Jets, Blondie and more already announced to play.
Full details of the line-up can be found here.
Secret Garden Party have also revealed the details of a competition to design artwork which will be displayed at the festival. The chosen designer could receive a grant of up to £1,000.
Click here for more information about the competition.
Tickets for Secret Garden Party are on sale now, priced at £155 for the weekend, including camping, parking and a programme.