Aiming at the power supply problem in medium-distance and strong electromagnetic interference environments such as rocket ignition and wireless sensing, a visible light wireless energy transmission system is designed, which uses visible light to achieve wireless energy supply at a distance of several meters. The optical model of the visible light wireless energy transmission system was established by the optical simulation software, the influence of the axial defocus of the light source and the displacement of the plano-convex lens on the light energy utilization rate, the uniformity of the spot, and the photoelectric conversion efficiency were analyzed, and the experimental parameters of the system were determined, which provides a basis for the realization of higher-power, longer-distance, and higher-efficiency visible light wireless energy transmission and variable-distance transmission automatic devices. Experimental results show that the use of a combination of reflective and condensing lenses greatly reduces beam scattering and effectively improves the energy transmission efficiency of the visible light wireless energy transmission system. The system helps to cover the the meter-level blind area, and provide the power supply at a low cost for the low power devices in some extreme environments where battery replacement is inconvenient and electromagnetic interference is serious.