Liverpool indie trio The Wombats will headline the first night of the festival, with Won't Go Quietly rapper Example and Beardyman in support.
Snoop Dogg will headline on Saturday, performing his 1993 debut album Doggystyle in its entirety. The Drums, Groove Armada and Lykke Li will also play on the second day.
Scissor Sisters headline on Sunday, with Blondie, Robyn, Kelis and Marc Almond also confirmed.
Lovebox takes place at Victoria Park in London between July 15 and July 17. Tickets are on sale now.