Vulnerability analysis of power communication network has important significance to ensure the safe operation of the power system and strengthen the network robustness. First, power communication network model is built. Based on the network business layer, network transmission layer and physical layer index, the vulnerability assessment and analysis model of power communication network based on the degree of destruction and network loss is established. Then invalid proximity of communication nodes and edges then can be got by analyzing the indicators such as proximity degree of services' invalid, bandwidth proportion and physical failure probability of communication side. Finally, the vulnerability value of nodes and edges can be got by combining with the loss degree of the system after the failure of network components. The vulnerability analysis of communication network is completed by taking the IEEE-30 node system as a simulation example. The results show that the length and service allocation scheme of communication links are closely related to the vulnerability of power communication network. This work is supported by Science and Technology Support Plan Project of Sichuan Province (No. 2017GZ0349) and Science and Technology Project of State Grid Xinjiang Electric Power Company (No. SGXJXT00TJS1600206).