The invention discloses a photo-thermal combined modeling method for a compound paraboloid concentrator. The method includes the steps that firstly, a geometric model of the compound paraboloid concentrator is generated according to geometric design parameters; afterwards, sun illumination data are read; the orientation and the inclination angle of the installation surface of the compound paraboloid concentrator are combined for light ray tracing, and heat flow distribution brought by illumination on the surfaces of all parts of the compound paraboloid concentrator is estimated; then the heat flow distribution obtained through calculation serves as a heat flow type boundary condition to be added into a thermodynamic model of the compound paraboloid concentrator, and weather data and operation parameters are combined for calculating temperature distribution; and finally, collected and converted solar energy, operation efficiency and other performance indexes are calculated according to temperature distribution. The more accurate and more comprehensive modeling method is provided for the compound paraboloid concentrator, the defect that an existing modeling method is lacking in photo-thermal combination is overcome, and a stronger and faster simulation tool can be provided for design of the compound paraboloid concentrator.