The present invention relates to a plant cultivation apparatus for maintaining dissolved oxygen by blocking radiant heat to normally and safely facilitate the growth and development of ornamental plants and esculent plants planted in a plant cultivation apparatus by combining a heat conduction blocking member, which blocks the radiant heat, with the outside surface (exposed surface) of the plant cultivation apparatus to prevent a phenomenon in which the dissolved oxygen amount of moisture is minimized because the water temperature in a subirrigation plant cultivation apparatus exposed to solar heat rises to about 50°；C. The present plant cultivation apparatus comprises: a water tank flowerpot which accommodates water as a moisture absorption member of the opened water tank space, and in which the moisture absorption member for growing plants, a fertilizer pack, and planting soil are sequentially arranged from the bottom by forming the water tank space comprised of a synthetic resin or metal materials； a heat conduction block member including multiple air layers for providing a stable growth environment not to reduce the dissolve oxygen amount provided to the rhizosphere part of the planted plant by preventing water accommodated in the water tank flowerpot from being risen by preventing the temperature rise of the water accommodated in the water tank flowerpot by blocking the radiant heat conducted from the sun from being conducted to the outside by being arranged outside of the water tank flower pot； and an adhesion member equally coated on the outside to prevent the water tank flower pot from being separated from the heat conduction block member.본 발명은 야외에서 태양열에 온전히 노출된 저면관수식 식물재배관리기에 수온이 50℃정도로 상승하여 수분의 용존산소량이 극소화되는 현상을 방지하기 위하여 식물재배관리기의 외측면(노출면)에 복사열을 차단하는 열전도차단부재를 결착하고, 이에 따라 식물재배관리기에 식재된 관상용 및 식용 식물의 생육이 안전하고 정상적으로 활성화되도록 한 복사열을 차단하여 용존산소량을 유지하기 위한 식물재배관리기에 관한 것이다. 본 식물재배관리기는 합성수지 또는 금속재질로 이루어진 수조공간을 형성하여 바닥에서부터 식물생육을 위한 수분흡수부재, 비료팩, 식재용토가 순차적으로 마련되어 있고, 상측이
