The invention relates to the field of electric power communication, in particular to an unavailability-based electric power communication network risk assessment method, which comprises the steps of:grouping electric power communication networks; determining risk factors existing in each group of power communication networks; classifying and counting the risk factors; obtaining the number of faults of each group of power communication networks in the statistical time, the repair time of each fault and the statistical time, and calculating the unavailability of the group of power communicationnetworks; counting the unavailability of each group of power communication networks; and performing risk assessment on the power communication network according to the unavailability of each group ofpower communication network. According to the unavailability-based electric power communication network risk assessment method provided by the invention, the risk assessment of the electric power communication network can be realized by analyzing the unavailability of the electric power communication network, so that multi-dimensional and multi-level data analysis is realized, and the investmentof manpower and material resources is reduced.