The present invention relates to a hydroponic system. More specifically, the present invention relates to a hydroponic system which is constructed in a way that respective plant cultivation plates having plants planted therein are stacked in multiple stages on a plant cultivation device installed indoors, the plant cultivation plates are capable of being moved horizontally, upwards or downwards after the plant cultivation plates are stopped for a predetermined time by the control of a control unit, and a nutrient solution is supplied toward roots and leaves of the plants by a spraying method in a state that the plant cultivation plates are stopped such that the plants can be cultivated. The hydroponic system according to the present invention comprises: a hydroponic rack (10) including horizontal members (11) which are horizontally installed at predetermined intervals, and vertical members (12) which fix the horizontal members (11)； nutrient solution supply nozzles (19) each of which is fixed to upper and lower ends of the hydroponic rack (10) such that the nutrient solution supply nozzles (19) spray a nutrient solution in upward and downward directions, and nutrient solution storage units (18) which supply the nutrient solution to the nutrient solution supply nozzles (19)； motors for rotation (27) which are installed at both sides of the upper end of the hydroponic rack (10), chains for movement (21) which are connected to the motors for rotation (27), and circulation racks (20) which are connected to the chains for movement (21) and positioned at both sides of the lower end of the hydroponic rack (10)； and hydroponic plates (30) which are movable along rails (13) disposed on the hydroponic rack (10) or circulation rack rails disposed on the circulation racks (20), and which have wheels disposed on the bottom thereof. The hydroponic system according to the present invention has effects that the hydroponic system can cultivate a large amount of plants, can harvest t
