The invention discloses a photo-thermal power station optimal configuration method based on individual optimization and system multi-energy complementation. The method comprises the steps: analyzing the capacity characteristic, the electric quantity characteristic, the economical efficiency, the reliability, the flexibility and the environmental protection property of a photo-thermal power stationoriented to planning based on the energy flow relation of the photo-thermal power station and the technical indexes of the photo-thermal power station; establishing an optimization objective by taking the minimum leveling kilowatt-hour cost of the photo-thermal power station as an objective function, and calculating the scale configuration of each subsystem of the photo-thermal power station according to the photo-electric capacity ratio and the heat storage hours of the photo-thermal power station obtained by simulation; constructing a complementary optimization configuration model containing the photo-thermal power station by taking the lowest total cost of the complementary system as a target, constructing a constraint condition to generate configuration capacities of various power supplies in the complementary system, and guiding planning and production putting of the various complementary power supplies in an actual system according to a determined capacity configuration result.The method can be applied to individual optimization configuration of the photo-thermal power station and capacity optimization configuration of a complementary system containing the photo-thermal power station, and provide a guide for power supply investment decision making.