Disclosed is a water cultivation apparatus which includes a cultivation bed which is stacked on an upper side and a lower side of a frame of the apparatus and an LED light unit which is closely joined to the lower side of the cultivation bed and irradiates LED light. The water cultivation apparatus is characterized by the heat generated by the LED light unit that is directly transferred to the cultivation bed, and is cooled by a culture medium circulated through the cultivation bed.COPYRIGHT KIPO 2014장치 프레임의 상하로 적층되어 배치되는 재배배드와, 재배배드의 하부면에 밀착결합되어 하부로 LED 조명광을 조사하는 LED 조명유닛을 포함하며, 조명유닛에서 발생되는 열은 재배배드로 직접 전달되어 재배배드로 순환하는 배양액에 의해 냉각되는 것을 특징으로 하는 수경재배장치가 개시된다.
