A cultivation window device comprises a plurality of frame structures that forms multiple layers of window structure, wherein the bottom of the bottommost layer of window structure and the top of the topmost layer of window layer are plane surfaces, while the bottom frame structures of other layers of window structure are slots protruded from the planes and a recess formed on the top. In addition, the leftmost and rightmost sides of each layer of window structure are plane surfaces. The frame structure of each window structure comprises at least one protruded slot or a recessed slot corresponding to the adjacent frame structure to be jointed together each other. The frame structure comprises a separable bottom section and a top cover, wherein the landscape plants can be cultivated on the separated bottom section and the separated top cover is a hollowed configuration with a transparent sheet attached to each of front and rear surfaces thereof. When the separated top cover is set on the separated bottom section, the landscape plants cultivated in the interior can be observed through the transparent sheets.
