The library at the Historical Museum of Sliven has 11 300 volumes of scientific, periodical and local history literature.

   It preserves valuable old printed books, collections and magazines, which came out in the first years after the Liberation of Bulgaria from the Ottoman rule up to modern times.
  
   They are distributed in the following sections:

   - primitive society
   - First Bulgarian kingdom
   - wars with byzantium
   - History of the ancient world
   - great historical figures
   - the Revival period (18-19CC)
   - the liberation of Bulgaria - 1877-1878
   - Bulgaria and other peoples(relations, participation in the struggle for liberation)
   - figures of the National Liberation movement
   - Bulgaria after the liberation from the Ottoman rule
   - the organization for the liberation of Macadonia and Odrin
   - the union of Eastern Rumelia and the Bulgarian Principality in 1885
   - the Balkan wars 1912-1913
   - Bulgaria in the I World War
   - the period of fascist dictatorship 1923-1939
   - the partisan (guerrilla) movement
   - socialist industry
   - historical sciences
   - epigraphy and paleongraphy
   - archaeology
   - history
   - archival science
   - local history
   - law and law sciences
   - linguistics
   - social life and ethnography
   - bibliography
   - political sciences
   - international relations
   - the arts
   - others

   The library at the museum is the basis of active and fruitful research work on the part of the specialists at the museum, research workers and local history experts