The invention discloses a hue adjusting process for a high-whiteness coating white cardboard. An adding point of dye is selected at a head box through which core pulp passes; an adding point of a fluorescent whitening agent is selected at a feeding trough of which the surface is sized. According to the hue adjusting process disclosed by the invention, the dye and the whitening agent are separately added; when the hue is adjusted, control points are few and the adjusting time of the whiteness and the hue is short; and the adjusted finished paper not only meets the whiteness standard, but also achieves stable and uniform effects of the hue. According to the hue adjusting process disclosed by the invention, the consumption of the dye and the whitening agent is reduced and the quantity of the whitening agent in white water is little, so that the cost is reduced and the difficulty in wastewater treatment is reduced.