One of the Dombibliothek HIldesheim's main puposes is the preservation and study of its historic books and manuscripts as well as making them accessible to academia and the public. The Dombibliothek sees its role as an active one, getting especially involved in culture and society in and around Hildesheim and Lower Saxony.

Therefore, the Dombibliothek's cooperation partners are not just the diocese's cultural institutions, but also a variety of regional as well as national cultural and scientific institutions.