Color temperature adjusting method and illumination module

The invention discloses a color temperature adjusting method and an illumination module. The color temperature adjusting method comprises the following steps: selecting a first color temperature point on a first isocolor temperature line corresponding to a lowest target color temperature; selecting a second color temperature point on a second isocolor temperature line corresponding to the highest target color temperature; by taking the intersection points P1 and P2 of the first isocolor temperature line and the Planck curve and the intersection points P2 of the second isocolor temperature line and the Planck curve as tangent points, drawing tangent lines along the Planck curve, by taking the intersection point of the two tangent lines as A, dividing the area where the two tangent lines are located into four areas in the clockwise direction with the intersection point A as the original point, and selecting a color coordinate point in the area spaced from the area P1AP2 to serve as a third color temperature poi