With the continuous advancement of law enforcement integration, the demand of court for joint case handling increases. Under the background, this paper proposes an intelligent judgment platform based on the integration of cloud computing and fog computing. The paper starts from the existing technology based on cloud computing, analyzes its shortcomings, and introduces fog computing, which has advantages such as low delay, easy to deal with, mobile and so on. And then it raises a comprehensive solution of integration of cloud computing and fog computing. Finally, it introduces the process of the integration of cloud computing and fog computing, the plan of user identity authentication in the platform in detail and the method of task assignment based on D-S evidence theory. And by establishing a system of the cloud, fog, and equipment, it achieves the goal of cloud controlling, fog processing, equipment performing.