Disclosed is a facility tomato supplemental lighting adjustment and control method based on a growth model. Three growth stages of the tomato seedling stage, the flowering stage and the fruiting stage are selected, the tomato leaf net photosynthetic rates at different temperatures and with concentrations of carbon dioxide and light intensities are measured, corresponding light saturation points at different temperatures and with concentrations of carbon dioxide are obtained, and a tomato optimized light saturation point model is built; the temperature, the concentration of carbon dioxide and the light intensity in the tomato growth environment are monitored in real time, whether the current light intensity is at the light saturation point corresponding to the current temperature and the current concentration of carbon dioxide is judged according to the growth stage of tomatoes and the tomato optimized light saturation point model, and if not, an LED light source is used for light supplementation until the light intensity reaches the light saturation point. The invention further provides a facility tomato supplemental lighting adjustment and control system based on the growth model, intelligent and quantitative light supplementation of the tomatoes is achieved, and great significance is brought to energy-saving and high-efficiency production of the facility tomatoes.