PROBLEM TO BE SOLVED: To provide a plant cultivation machine allowing to easily perform cleaning work including resin sheet change by preventing caulking material ingredients from melting into a water culture medium and affecting plants.SOLUTION: This plant cultivation machine is such that a gutter-like drainage tank 4 for receiving a water culture medium to be discharged from a cultivation tank 2 is arranged in a removable manner, adjacent to the cultivation tank 2 for cultivating plants by soaking in a water culture medium, and synthetic resin sheets 6 are covered in a series on the upper surface of the cultivation tank 2 and the upper surface of the drainage tank 4 along the inner surface of each of the tanks. Furthermore, an overflow part overflowing a water culture medium to the drainage tank 4 is formed on a wall of the cultivation tank 2, adjacent to the drainage tank 4, a discharge port 24 for discharging a water culture medium derived to the lower side of the sheets when cleaning is formed on the end position on the bottom of the cultivation tank 2, and a drainage port 42 connected with a drainage tube 43 is formed on the bottom of the drainage tank 4. The drainage tube 43 communicates with a water culture medium tank 8 for adjusting nutrition in a water culture medium and circulating to the cultivation tank 2.【課題】コーキング材の成分が水耕液中に溶け出して植物に悪影響を及ぼすことがなく、樹脂シートの交換を含む清掃作業が簡単に行える植物栽培機を提供する。【解決手段】植物を水耕液に浸して栽培するための栽培槽２に隣接して、栽培槽２から排出すべき水耕液を受けるための樋状の排液槽４が取り外しが可能な状態で配設されている。栽培槽２の上面および排液槽４の上面には各槽の内面に添わせて合成樹脂製のシート６が一連に被せられている。栽培槽２の排液槽４と隣接する壁には水耕液を排液槽４へ溢れ出させる溢水部、栽培槽２の底面の端部位置には清掃時に前記シート下へ導出させた水耕液を排出するための排出口２４がそれぞれ形成されるとともに、排液槽４の底面には排液管４３が接続された排液口４２が形成されている。排液管４３は、水耕液中の養分を調整して栽培槽２へ循環させるための水耕液タンク８に連通させている。【選択図】図４
