The invention discloses a solid light microchannel array panel and a preparation method thereof. The panel comprises a panel body, wherein the panel body comprises light-tight base bodies and multiple light-permeable channels; the light-tight base bodies are arranged among the light-permeable channels which are solid light channels. The preparation method comprises steps as follows: first light-permeable medium material bars and light-tight base body material bars are drawn into thin first light-permeable medium material bars and thin light-tight base body material bars; the thin first light-permeable medium material bars and the thin light-tight base body material bars are arranged and combined into primary composite bars; the primary composite bars are drawn into primary composite channel filaments; the primary composite channel filaments are made into blank composite filament bars; the blank composite filament bars are melt to form blank bars; the blank bars are subjected to follow-up processing, and the solid light microchannel array panel is obtained. The light channels have a large length-diameter ratio, the optical effect is good, requirements for environments in the packaging and use processes are low, and the panel is high in strength and efficiency, low in cost, flexible and capable of being widely applied to the field of optical elements.