The invention relates to an optical path establishing method and system for a power distribution communication network. The optical path establishing method for the power distribution communication network comprises the following steps of: acquiring a plurality of to-be-transmitted power distribution services in the power distribution communication network, detecting a request frequency of each to-be-transmitted power distribution service in a set time period, and according to a sequence of the request frequencies from big to small, carrying out sorting on the to-be-transmitted power distribution services; according to the sorting, sequentially determining each to-be-transmitted power distribution service as a target power distribution service, and identifying a source node and a sink node of the target power distribution service; according to each routing port of the power distribution communication network, establishing a virtual link between the source node and the sink node; and when residual transmission capacity of the virtual link is higher than or equal to service capacity of the target power distribution service, establishing an optical path corresponding to the virtual link in the power distribution communication network. According to the optical path establishing method and system for the power distribution communication network, which are provided by the invention, on the basis of ensuring a transmission effect, energy consumption caused in the process of transmitting the power distribution services is effectively reduced.