The invention relates to a distributed power supply combined power generation system and a dispatching coordination control method. All distributed power supplies accessing to the distribution network are divided into a plurality of distributed power supply combined control bodies according to installation sites; each power supply combined control body is respectively provided with a corresponding combined coordinator; each combined coordinator is used for adjusting the generating capacity of each distributed power generation equipment according to the current generating capacity and generating cost of each distributed power generation equipment in the corresponding power supply combined control body and the generation schedule of the corresponding power supply combined control body issued by the distribution network; when the generation scheduling value is greater than the current generating capacity of the power supply combined control body, the generating capacity of each power generation equipment in the power supply combined control body is increased; and when the generation scheduling value is smaller than the current generating capacity of the power supply combined control body, the generating capacity of each power generation equipment is inhibited. The system can realize reasonable decomposition of the generation schedule and realize controllable distributed power supply combined generating capacity while the economy of power generation is taken into account according to the generation schedule issued by the distribution network.