The present invention provides a device management system. The system comprises a device file management module, a maintenance planning management module, a fault management module, an inspection maintenance work order management module, an expense budget module, a statistic analysis management module, a prompting module and a system management module. The device file management module is configured to store and manage the basic static information, the whole life cycle document data, the device faults, the maintenance history and the device changing information of a device and provide functions of addition, deletion, modification, query and statistics analysis; and the maintenance planning management module is configured to perform establishment, examination and approval, issuing and execution, statistics and analysis query of a preset plan project; and the fault management module is configured to report fault records and start a fault confirmation process after device defects or faults are detected, eliminate faults according to the corresponding preset fault processing mode after confirmation of the faults and record the faults in the fault knowledge base. The efficiency and the precision of management are improved, and a lot of manpower is saved.