A color-mixing lighting control method is used for receiving an original color-mixing light data to control a color-mixing light source. The color-mixing light source includes a plurality of light-emitting elements to produce a plurality of emission colors. The original color-mixing light data includes a plurality of original light intensity values corresponding to the emission colors. The color-mixing lighting control method comprising: determining a maximum value of the original light intensity values; calculating the light intensity percentage of each of the emission colors in the original color-mixing light data according to the original light intensity values; generating the corrected light intensity value of each of the emission colors according to the maximum value and the light intensity percentage of each of the emission colors; and respectively controlling the light-emitting elements by using the corresponding corrected light intensity value of each of the emission colors.