The invention discloses a mixture of rare earth colorants and a preparation method of the mixture. The mixture can significantly prevent rare earth sulfide pigments from generating hydrogen sulfide gas in water. The mixture is dispersed in water, and the concentration of the hydrogen sulfide gas can be controlled to be 0.01 ppm or below, or even the hydrogen sulfide gas cannot be detected. The mixture is obtained by adopting simple processes and equipment and is suitable for large-scale industrialized production. The mixture improves the performance of rare earth sulfide finished pigments andgreatly expands the application field of the rare earth sulfide finished color materials.