Provided is an external culture solution siphon formwork. Through a solution feeding device which is arranged in a culture solution storage pot to continuously extract culture solution to a plant planting pot and an external siphon device connected with the culture solution storage pot and the plant planting pot, the siphon effect of full pipe flow is formed through the pipe diameter changes of a pipe fitting of the external siphon device, so that culture solution extracted to the plant planting pot by the solution feeding device can perform repeated circulation between a high liquid level line and a low liquid level line to achieve the goal of plant planting.一種外置式養液虹吸架構,透過一設置於一養液儲存盆內持續抽取養液至一植物栽種盆之給液設備,以及一連接該養液儲存盆及該植物栽種盆的外置式虹吸設備,以該外置式虹吸設備由管配件的管徑變化來形成滿管流的虹吸作用,使該給液設備抽取至該植物栽種盆之養液能在一高液位線及一低液位線之間往復循環達到植物栽種目的。15‧‧‧栽培植物2‧‧‧外置式養液虹吸架構21‧‧‧給液設備211‧‧‧抽液物件212‧‧‧給液管22‧‧‧外置式虹吸設備223‧‧‧水平段23‧‧‧虹吸輔助物件231‧‧‧開口端232‧‧‧封閉端233‧‧‧裝設空間234‧‧‧隔離物件3‧‧‧植物栽種盆4‧‧‧養液儲存盆H‧‧‧高液位線L‧‧‧低液位線
