An improved Harris Hawk Optimization Algorithm is proposed to optimize the position information of light sources in traditional indoor four light source layouts, addressing the issues of uneven reception power and uneven illumination in visible light communication. Simulation with Matlab R2018b shows that the optimized light source layout in this paper has a more uniform power distribution, with a power variance of 0.359dBm, an illumination range of 368.32lx~665.18lx, and an illumination uniformity of 72.25%, all of which are better than the original light source layout, PSO algorithm, and HHO algorithm optimized light source layout. Therefore, the proposed light source layout optimization method in this paper has a significant improvement effect on indoor visible light communication.