In 1907, The Barcelona Museums Board creates the Special Library Committee. Two aspects should be mentioned about this period: on one hand the important efforts that Josep Puig i Cadafalch and Joaquim Folch i Torres made to consolidate the Library, and on the other the notable enrichment of the collection with the donation, in 1914, of the Vidal i Quadras Library, the Riquer acquisition in 1921, and the donation by Eduard Toda in 1931. In 1933, the Library moved to the Poble Espanyol, to premises created around the International Exhibition of 1929.

1916 Cover of the book “Una visita al Museu de Barcelona”, by Joaquim Folch i Torres

In this book the Library's installation and services in the old arsenal building are recorded, from this year on the home of the Museum of Art and Archaeology. It mentions that at that time the Library contains 3,000 items.