- To ensure that documentary resources of national significance relating to Sri Lanka are collected, preserved and made accessible.
- To make available the National Collection (Sri Lanka Collection) for the use of all sections of the community in meeting the nation’s information needs
- To make available all other publications published in, or relating to Sri Lanka or foreign publications that cater the local user needs.
- To receive all Sri Lankan publications under the Legal Deposit Law
- To preserve the national and cultural heritage of Sri Lanka
- To disseminate information in a very user-friendly manner
- To promote and enhance resource sharing and co-operation among libraries and library professionals
- To enhance learning and knowledge creation