Rock Werchter saw off competition from Cornbury (UK), Roskilde Festival (Denmark), Exit (Serbia) and the Paléo Festival of Switzerland. The Belgian festival won thanks to its good organisation and impressive line-up.
Rock Werchter hadn't won the prize since 2008.
This year the festival Rock Werchter is being staged from 4 July until 7 July. The line-up includes Alt-J, Sigur Rós, Depeche Mode and the Editors.
Each year in London the ILMC (International Live Music Conference) brings together 1,500 professionals from the music business.