A sunlight modulation device includes a light focusing module and a light deflection module. The light focusing module is configured to let incident sunlight pass through and to converge direct sunlight of the incident sunlight. The light deflection module is configured to separate the converged direct sunlight from diffusion sunlight of the incident sunlight by reflecting the converged direct sunlight. The above-mentioned sunlight modulation device allows more diverse configurations for solar panels, heating devices or the like means, as well as illumination purpose.