The invention discloses a method and a system for predicting security situation of a power communication network. The method comprises the steps of extracting power communication network data from an original storage position through an extraction conversion uploading technology; uploading the predefined power communication network data related to the power communication network security situation evaluation to a data warehouse after data cleaning; pre-processing the power communication network data in the data warehouse; calculating based on the pre-processed power communication network data and based on a Spark platform to obtain a related index of the security situation; and optimizing a neutral network model based on a particle swarm optimization algorithm so as to calculate a security situation value of the power communication network, and classifying the risk level and early warning based on the related index of the security situation corresponding to the security situation value. The method for predicting security situation of a power communication network can realize high-performance and relatively high-accuracy real-time prediction for the security situation of the power communication network.