Abstract：Information integration in libraries PurposeThis paper investigates the latest achievements of studies on industrial information integration engineeringIIIEDesignmethodologyapproachThis paper extends the research by Chen2016by reviewing studies from 2016 to 2019 in IEEE Xplore and Web of ScienceAltogether970 papers related to IIIE are grouped into 27 research categories and reviewedFindingsThe results obtained in this study indicate that the number of research studies on IIIE rose drastically in the past three years compared with the findings in Chen2016Particularlyenergyengineeringindustrial controlinformation and communications technologiesinstrumentationmanufacturing and transportation are the hot topicsThis change proves that the Internet of thingsIoTand IIIE have integrated closely by providing more applicationssuch as industrial Internet of thingsIIoTcyber-physical systemCPSsmart grids and smart manufacturingThis change also proves the research direction of IIIE identified by Chen2016OriginalityvalueThe results present up-to-date development of IIIE and provide directions for future research on IIIEThe review identifies that energyengineeringindustrial controlinformation and communications technologiesinstrumentationmanufacturing and transportation are the main fields that most of the reviewed papers focus onApplications that integrate IoT and IIIEincluding IIoTCPSsmart grids and smart manufacturingare attracting scholarsand practitionersattentionSome new technologiessuch as 5G and blockchainhave the potential to be integrated with IoT and IIIELibrary AutomationImplement the automatic identificationtrackingregistration and inventory control through RFID and WSNSRetrieval and IndexingRFID technology and IoT allow more efficient books to retrieve and automate indexesand quickly find books that are put or leave by mistakeCollection classificationRFID technology can help automatically classify and manage the collectionsThe article mentioned that using IoT technologysuch as RFID and WSNSperform books monitoringregistration and inventory control in libraries to realize automatic identification and tracking of booksThis enables the library to automatically perform many functionssuch as self-borrowing booksself-returningintelligent inventoryintelligent queryetc