A kind of plant cultivating device, include a container made of waterproof board, the platen that is filled with water, and the planter units being housed in inside the container, the container includes one and defines a room and the locular wall with several leakage holes, and the platen that is filled with water includes that a pressing wall and one surround the pressing wall and defines the water retaining wall of a water space jointly. When this is filled with water platen position in a rest position, which is leaned against on a surface of the planter units, and when the platen that is filled with water be transformed into one be filled with water position when, the water space can accept by the container leakage hole outflow water. Aforementioned structure can also prevent the seed displacement of filling, make plant growth in correct position other than it can reduce material cost and improve plantation convenience.一種植物栽培裝置，包含由防水紙板製成的一個容器、一個盛水壓盤，以及一個容裝在該容器內部的種植單元，該容器包括一個界定出一個容室並具有數個漏水孔的室壁，而該盛水壓盤包括一個壓靠壁，以及一個圍繞該壓靠壁並共同界定出一個盛水空間的擋水壁。當該盛水壓盤位在一個壓靠位置時，該壓靠壁壓靠在該種植單元的一個表面上，而當該盛水壓盤轉換到一個盛水位置時，該盛水空間可承接由該容器之漏水孔流出的水。前述結構除了可以降低材料成本並提高栽種方便性外，亦可防止裝填的種子移位，使植物生長在正確的位置。
