An algae culture device mainly comprises a first floating platform, at least one second floating platform and at least one breeding unit, wherein the first floating platform floats on a water surface, and the breeding unit is connected in series below the first floating platform And the algae to be cultured are contained in the culture unit, and a settler is arranged at the lower end of the culture unit, and the settler sinks toward the bottom end of the water surface, so that the first floating platform and the culture unit are relatively perpendicular to the water surface. And the first floating platform, the breeding units and the settler do not move up and down with the fluctuation of the water surface, and cooperate with the light characteristics of the algae, so that the algae can ensure stable growth around the outer edge of the culture unit toward the water surface, thereby increasing The efficacy of algae farming production.一種藻類養殖裝置，其主要由一第一浮台、至少一第二浮台以及至少一養殖單元所構成，其中第一浮台浮設於一水面上，第一浮台下方串接有養殖單元，且於養殖單元之內部容設有欲養殖之藻類，養殖單元下端接設有一沉降器，沉降器朝水面之底端方向沉入，使第一浮台以及養殖單元與水面呈相對垂直設置，且第一浮台、各養殖單元以及沉降器不隨水面之起伏而上下移動，並配合藻類之向光性特性，令藻類可確保由養殖單元之外緣朝水面方向穩定環繞生長，進而達到增加藻類養殖產量之功效。
