The utility model relates to a hydroponic device, which comprises a bracket unit, two water collecting seats which are arranged at the bottom of the bracket unit and respectively define two water collecting tanks, two fixing seats which are arranged on the top of the bracket unit and respectively define two accommodating spaces, and a plurality of fixings A planting pipe, a plurality of water-carrying units and a circulation unit that respectively connect the plurality of accommodating spaces and the planting troughs of the sump are defined between the sump and the fixed seats. Each culvert unit is located in a respective planting trough and includes two rooting layers having a plurality of pores, and a water retaining layer between the rooting layers. The circulation unit comprises a water delivery pipeline, a plurality of pressure regulating drip heads connected to the water supply pipelines and respectively located above the planting tanks, and a water collecting pipeline connecting the water collecting tanks, the novel plant is available for the plants to be rooted in the water collecting pipelines The water culvert unit is configured to transport water containing nitrogen compounds to the planting tanks for utilization and purification by the plant, and then collect and reuse the purified water.一種水耕裝置，包含一支架單元、二設置於該支架單元底部且分別界定出二集水槽的集水座、二設置於支架單元頂部且分別界定出二容置空間的固定座、複數穿設於該等集水座及該等固定座間且分別界定出複數連通該等容置空間及該等集水槽的種植槽的種植管、複數涵水單元及一循環單元。每一涵水單元位於各自的種植槽內且包括二具有複數孔隙的紮根層，及一位於該等紮根層間的保水層。該循環單元包括一輸水管路，複數連接該輸水管路且分別位於該等種植槽上方的穩壓滴頭，及一連通該等集水槽的集水管路，本新型可供植物紮根於該等涵水單元，並藉由該循環單元將具含氮化合物的水輸送至該等種植槽供植物利用及淨化，再將淨化後的水收集再利用。
