To provide an automatic library system capable of properly performing the maintenance of books by reducing unidentified books caused by the omission of the read of book information while improving the efficiency of the reading work of the book information.

The automatic library system 1 carries a container 15 by using a carrying means 50 between stacker cranes 6A and 6B capable of storing a plurality of books 16 and warehousing or delivering the container 15 from a library 4 and an incoming/outgoing station 10 for performing book take-out work and book storage work to the container 15 by a worker, and reads the book information by a book information reading means 21 from an IC tag 17A arranged on the books 16 in the incoming/outgoing station 10, and informs the worker of warning information by a warning informing means 27 when the read book ID number T1 does not coincide with a volume number T inputted by a reading book number input means 25.