The invention discloses an unified data center management system and a management method thereof. The unified data center management method comprises the steps of basic information management, resource planning management, resource management, process management, operating and maintenance management, task management, resource optimization, resource monitoring and system setting; the unified data center management system comprises a basic information management module, a resource planning management module, a resource management module, a process management module, an operating and maintenancemanagement module, a task management module, a resource optimization module, a resource monitoring module and a system setting module. By means of the unified data center management system and the management method thereof, operating and maintenance operation and processes can be regularized, physical resources and virtual resources are managed uniformly, an uniform interface, uniform management,uniform application and uniform allocation are achieved, the resource utilization rate is improved, energy consumption is effectively controlled, the automation management degree of a data center is improved, and manual involvement is reduced so that the personnel training cost can be reduced, and the management efficiency is improved.