The invention discloses a spectrum matching method for a multicolor LED to realize chroma limitation. The method is characterized by firstly, through sampling and measurement, acquiring spectrum sample data of each color single LED; then, converting a spectrum to be matched and illumination so as to acquire corresponding target spectral radiant brightness distribution and an absolute tristimulus value; and finally, using a constraint differential evolution algorithm to carry out iteration matching so as to acquire a corresponding LED driving value. And simultaneously, in the invention, a spectrum matching evaluation index, a chromaticity difference, an illumination error percentage are used to evaluate a matching result. By using the method, disadvantages in a current spectrum matching method are overcome, demands of an actual illumination application to the light source chromaticity, the illumination, the spectrum and other illumination quality aspects can be satisfied and a practical and effective realization method of continuous adjustment of a light source color temperature and the illumination is provided.