A composite color separation system, comprises: a light control module, a light guide module and a light splitting module. The light control module has a lighting unit and a lens unit, in which the lighting unit includes an array of lighting elements whereas there are at least two types of lighting elements in the array for emitting at least two beams of different wavelengths. The light from the lighting unit is directed to enter the lens unit before being discharged out of the light control module. The light guide module comprises: a first light incident surface, for receiving the beams from the light control module; a first light emergence surface; and a light guide structure, for guiding the beams to the first light emergence surface where they are discharged out of the light guide module to the light splitting module. The light splitting module is used for splitting the beams.