It becomes possible to use multi-source data to diagnosis faults with the development of information technology in power system. At present, fault data are divided into two kinds:the switching data and electric data in fault diagnostic system based on multi-source data which leave the difference among these data out of consideration. To solve this problem, this paper divides fault data into 3 kinds and proposes a power system fault full information diagnosis model based on multi-source data according to the characteristics of these data. The model includes two modules. The first is to use real-time data to achieve rapid fault diagnosis, and then use the data containing more comprehensive information to conduct comprehensive fault information processing. PSCAD and Matlab are used for joint simulation to verify the feasibility of the model. This work is supported by National Natural Science Foundation of China (No. 51777119).