An embodiment of the invention discloses a remote information acquisition system for an unattended substation, and the system comprises a data acquisition module, a fault intelligent processing moduleand terminal equipment, wherein the data acquisition module is used to collect related equipment failure data, and send the encrypted related equipment failure data to the fault intelligent processing module and the terminal equipment; the fault intelligent processing module is used to analyze the related equipment failure data, send several possible failure causes obtained by analysis to the terminal equipment, and send a decision plan for processing the corresponding failure to the terminal equipment; and the terminal equipment accepts the possible failure causes and decision plan for further analysis and confirmation of the failure causes and decision plan. A fault database containing fault data is set in the fault intelligent processing module, which not only improves the speed of fault cause analysis and fault solution formulation, but also avoids misjudgment and misoperation.