The invention discloses a method and a device for regulating a power grid plan. The method comprises the steps of determining limiting factors of each thermal power plant in a thermal power plant group to a receiving end power grid according to preset multidimensional quantization parameters; regulating the plan of the receiving end power grid according to the determined limiting factors. According to the technical scheme provided by the invention, an analysis result of influence of the thermal power plant group on the receiving end power grid can be more comprehensive, meticulous and accurate, and the method is beneficial for regulating the power grid plann and connecting the thermal power plants.