The invention provides a power service transmission method and apparatus based on a packet enhanced optical transport network. The method comprises the following steps: obtaining a node affiliation list and service list information of a power system; determining a power service dominator in the power system according to the node affiliation list and the service list information, and generating a power service routing dominator list; screening out source and sink nodes belonging to cross-domain service data of different areas from the power service routing dominator list; performing division according to the security isolation attributes of the cross-domain service data to divide the cross-domain service data into dedicated line service data and non-dedicated line service data, wherein thesecurity isolation attribute value of the dedicated line service data is higher than that of the non-dedicated line service data; and separately allocating transmission ports to the dedicated line service data and the non-dedicated line service data to access a backbone network for transmission.