Its CORE functions include:
- To collect legal deposit material (print and non-print), material from private/commercial, Federal and state government agencies
- The receipt and documentation of all serials, monographs, newspapers, private/commercial, Federal and State government publications
- Compilation and production of National Bibliography of Nigeria (NBN)
- Developing, maintaining and management of online national union catalogue (ONUC) Database
- Organizing sensitization workshops for publishers/authors and printers to ensure compliance
- Marketing and distributing the national Bibliography of Nigeria (NBN)
- Compilation of National Library of Nigeria subject authority files
- Maintenance of legal deposit catalogue obligation by publishers
- To ensure the compliance of legal deposit obligations by publishers