The invention relates to a method of intelligent light-environment controlling based on multi-factor coupling. The method includes setting illumination cumulative time according to illumination demand characteristics of plants in the current environment, monitoring real-time red-blue light PFD (photon flux density) value and real-time temperature value in the environment during the illumination cumulative time, matching optimum environment light intensity with the temperature, calculating differences between monitoring values of the red-blue light and target values according to red-blue light saturation point of current plants on different temperature conditions, performing supplementary lighting as demanded, adjusting temperature to be in a threshold range of photosynthesis effective temperature when the monitoring value excesses. The invention further provides a system for implementing the method of intelligent light environment controlling. A multi-factor coupling based intelligent light-environment controlling algorithm is called, so that precise controlling on temperature and sub-band light intensity of the environment is completed; light adjustment can be effectively controlled through a PWM (pulse-width modulation) controlling signal based on minimum energy consumption; and the optimized controlling on the temperature and the sub-band light intensity of the plant growing environment is realized.