The present invention relates to a retractable book sterilizer, which comprises a sterilizing main body in which a book is stored and a sterilizing space in which a sterilization process is performed is formed； A transparent door which is openable and closable at the front of the sterilizing main body and is made of a transparent material so that the sterilizing process is exposed to the outside； A sterilizing unit provided in a lower region of the sterilizing main body to generate a sterilizing power for sterilizing the book and forcibly deliver sterilizing power including sterilizing power to the sterilizing main body by an air current； A plurality of cradles which are laterally coupled to the sterilizing space and on which the books are mounted； A sterilizer main flow unit coupled between the cradle and a rear surface of the sterilizing main body and configured to guide the sterilizing apparatuses generated in the sterilizing unit to the book； An input unit formed at the front of the sterilizing main body and adapted to select one sterilization mode of sterilization, antibacterial, sterilization, antibacterial combination and storage of the book from the user； A display unit for displaying an operating state of a sterilization mode and a storage of books in the sterilizing main body； A controller for controlling operations of the sterilizer and the sterilizer flow unit according to a sterilization mode input from the input unit； And a beam sensor unit provided on the sterilizing main body and the upper surface of the cradle, wherein the cradle is formed in a mesh shape so that the sterilizing device flow can flow, and the cradle main body includes a plurality of hooks on the lower surface, A support frame installed on an inner wall surface of the sterilizing main body so as to be fixed to the sterilizing main body, a book end supporting the book located above the cradle main body so as not to fall over, The book end includes a hook portion formed by bending a wir
