The invention discloses a cloud-fog integrated industrial Internet of Things cognitive energy management system and computing method thereof, wherein a structure of the system comprises an industrialequipment layer, an industrial cloud-fog cognitive computing layer and an energy management layer. The industrial cloud-fog cognitive computing layer comprises industrial cloud computing and industrial fog computing; and the energy management layer, taken as a top layer of an architecture, takes charge of providing diversified energy management applications, and comprises an energy cognitive module, an energy analysis module, an energy prediction module and an energy optimization module. In the system and the method provided by the invention, by cloud computing, infinite resources can be provided for mitigating a problem of limitation of fog computing resources, problems of high delay, network congestion and low reliability caused by cloud computing can be mitigated through fog computing edge information processing capacity, cloud-fog integration is realized through construction of a penetration model between fog computing and cloud computing, under guidance of minimizing consumption of cloud-fog resources, an energy management service is allocated rationally between the cloud and the fog, rational and efficient utilization of the cloud-fog resources is realized, and consequently,efficient IIoT energy management is realized.