This invention provides an illumination cultivating apparatus for aquatic plants, comprising an accommodating body, a light-emitting assembly and a nutrient accommodating bucket, wherein the light-emitting assembly is disposed in an accommodating space of the accommodating body, and a circuit board of the light-emitting assembly is encapsulated together with a light-emitting element and a control element and a power supply element, thereby enabling the light-emitting assembly to directly disposed in water and directly irradiate aquatic plants therein and the nutrient accommodating bucket is used to deliver carbon dioxide into water for being consumed by the aquatic plants as nutrients, so that the aquatic plants therein may perform photosynthesis and absorb the nutrients to effectively increase the cultivating efficiency.本發明係提供一種水生植物照明養成裝置,係包括:一容置體及一發光組件及一養分容置桶,所述該發光組件係設置於該容置體之容置空間內,且所述該發光組件之該電路板係與該發光元件與該控制元件與該供電元件係相互封包,以使所述該發光組件可直接設置於水裡且對其水生植物直接進行照射,而該養分容置桶則將二氧化碳送至水裡供水生植物為養分使用,以使其水生植物可進行光合作用且可吸收養分以有效提高其養成效率之功效者。1‧‧‧水生植物照明養成裝置2‧‧‧容置體21‧‧‧容置空間3‧‧‧發光組件31‧‧‧電路板311‧‧‧發光元件312‧‧‧控制元件313‧‧‧供電元件32‧‧‧控制器4‧‧‧養分容置桶41‧‧‧排氣管
