The invention provides a method for monitoring an end-to-end service communication state of a power communication network. The method comprises the following steps: establishing a service channel cross-domain serial standard model of the power communication network, and constructing data paths among various manufacturers, various technical systems and all levels of communication resources; accomplishing end-to-end service communication routing analysis by using a self-extending algorithm, and drawing a whole-journey routing map by using the computer graphic technology; and calculating and displaying a real-time state of each node in the communication routing by using alarm information of all kinds of communication devices as basic data sources. By adoption of the state monitoring method, the whole-journey routing and the real-time state of the service communication channel can be displayed, and a service-oriented end-to-end whole-journey communication monitoring means is provided for operation and maintenance management of power communication.