The invention provides a method and system for planning and optimizing a new energy grid-connected power communication network. The method comprises the following steps: determining a communication service demand of new energy grid connection; acquiring current data of a power communication network; and planning or optimizing the power communication network based on the communication service demand and the current status of the power communication network. The method and system take the service demand of the new energy grid connection into account, take a unified consideration of communicationnetwork planning and optimization, and classify new energy grid-connected communication services as protection of an ultrahigh voltage alternating and direct current hybrid power grid system, preciseload control and promotion of automatic demand response of new energy consumption; and the provided communication network planning and optimizing method is more suitable for developing intelligent power grids and energy internets for a new energy grid connection demand.