Provides a plant factory system using sunlight. The present invention provides a light collecting unit for collecting sunlight by having a first light collecting unit and a second light collecting unit provided in the upper open area of the cultivation building； At least one light transmissive filter that receives the sunlight collected by the first condenser and transmits a portion of the transmitted sunlight through the first optical cable to the sunlight for illumination, and reflects the remaining sunlight to the sunlight for power generation It is equipped with an optical filter unit for separating the sunlight into the solar light for illumination and power generation； An illumination unit for arranging an optical pipe connected to the optical filter unit in the cultivation room to illuminate an interior space of the cultivation room by illumination light that is transmitted by the light transmission reflection filter and supplied into the light pipe； A heat storage chamber configured to receive solar light collected by the second light collecting unit through a second optical cable, and a black body that generates heat by radiant energy of sunlight transmitted through the second optical cable inside the heat storage chamber, A heat storage unit for accumulating thermal energy by having a phase change material phase-changed by the black body in the heat storage chamber； And a heat exchanger disposed in the heat storage chamber and having a first heat exchanger for absorbing the heat energy stored therein, and a second heat exchanger disposed in the growth chamber for releasing heat energy. It includes.태양광을 이용한 식물공장 시스템을 제공한다. 본 발명은 재배건물부의 상부 노천영역에 구비되는 제1집광부와 제2집광부를 갖추어 태양광을 집광하는 집광부 ； 상기 제1집광부에서 집광된 태양광을 제1광케이블을 매개로 전달받아 전송된 태양광의 일부는 조명용 태양광으로 투과시키고, 나머지 태양광은 발전용 태양광으로 반사시키는 적어도 하나의 광투과반사필터를 갖추어 태양광을 조명용 태양광과 발전용 태양광으로 분리하는 광필터부； 상기 광필터부와 연결되는 광파이프를 상기 재배실에 배치하여 상기 광투과반사필터에 의해서 투과되어 상기 광파이프 내부로 공급되는 조명용 태양광에 의해서 상기 재배실의 실내공간을 조명하는 조명부 ； 상기 제2집광부에서 집광된 태양광을
