An objective of this invention is to allow nutrient solution to be simply drained from cultivation trays in a plant cultivating apparatus for circulating nutrient solution from upper cultivation trays to lower cultivation trays in sequence.The plant cultivating apparatus of this invention includes a nutrient solution tank 3 for storing nutrient solution, a nutrient solution circulating system 5 for pumping the nutrient solution from the nutrient solution tank 3 by a pump 51 to circulate the nutrient solution from upper cultivation trays 2 to lower cultivation trays 2 through a circulating pipe 54 communicating the cultivation trays 2 with one another, and a drain system 6 having a drain pump 61 connected to the cultivation trays 2 and a drain control valve 63 for draining the nutrient solution in the cultivation trays 2 from the drain pump 61.本發明之目的在提供一種植物栽培裝置,可使養液從上段的栽培托盤依序循環至下段的栽培托盤,且可易於將養液從上述栽培托盤予以排出。本發明之植物栽培裝置係具備:養液槽3,用於儲存養液;養液循環系統5,藉由泵51從該養液槽3汲取養液,並使養液透過用以連通該栽培托盤2彼此之循環管路54從上段的栽培托盤2依序循環至下段的栽培托盤2;及排水系統6,具備連接於上述栽培托盤2的排水管路61及從該排水管路61排出上述栽培托盤2內之養液的排水控制閥63。1‧‧‧植物栽培裝置2‧‧‧栽培托盤3‧‧‧養液槽4‧‧‧自動給水裝置5‧‧‧養液循環系統6‧‧‧排水系統11‧‧‧排出口31‧‧‧溢流用配管41‧‧‧浮體42‧‧‧閥43‧‧‧管路51‧‧‧泵52‧‧‧循環主管路53‧‧‧循環分歧管路54‧‧‧循環管路55‧‧‧養液送回管路56‧‧‧循環控制閥61‧‧‧排水管路62‧‧‧排水集中管路63‧‧‧排水控制閥64‧‧‧直接排水管路65‧‧‧直接排水控制閥
