The invention discloses a power communication network service routing method and a device, and the method comprises the following steps: A. generating an object optimization function according to a network optimization object; B. determining an initial node of a service and taking the initial node as the current node; C utilizing the ant colony algorithm for calculating the transition probabilities of all chains which are connected with the current node, while the transition probabilities are obtained by the calculation according to information elements on all the current chains; D. selectingthe next jump node as the current node according to the transition probabilities; E. judging whether the selected next jump node is a destination node or not of the service or not; if so, taking the selected next jump node as the current node, determining the information elements on all the current chains according to the object optimization function, and then repeatedly implementing the step C tothe step E; and otherwise, generating the routing which corresponds to the service according to the initial node of the service and all the selected next jump nodes. The method and the device can ensure the optimal performances of the multi-service routing in a power communication network.