The invention relates to a power communication network vulnerability evaluation and routing optimization method, and belongs to the technical field of power communications. The method comprises the following steps: modeling a network topology of a power communication network, and defining the power communication network as a weighted undirected network; establishing a vulnerability evaluation model of a node and a side according to a topology vulnerability factor, a business vulnerability factor and an equipment vulnerability influencing the vulnerability of the node and the side, and evaluating the vulnerability of the power communication network according to the vulnerability evaluation model. The factors influencing the vulnerability of the node and the side are summarized as three factors of topology vulnerability, the business vulnerability and the equipment vulnerability, and a comprehensive vulnerability index is obtained according to the relation of above mentioned three factors, thereby comprehensively displaying the vulnerability size of the node and the side, and improving the vulnerability evaluation accuracy of the power communication network.