The present invention relates to a hydroponic system and a water fog supply method using the same. The present invention includes: a hydroponic section made up of a cultivation chamber main body provided with a root accommodating space accommodating a root of a hydroponic crop, a supporting layer provided in an upper portion of the cultivation chamber main body with a plurality of flowerpots aligned therein, a filtering layer provided in a lower portion of the cultivation chamber main body, and a collecting tray provided in a lower portion of the filtering layer; a culture tank supplying a culture medium to the hydroponic section; a water tank supplying water to the hydroponic section; a fog generating unit made up of a water fog tank, a vibrator provided in the water fog tank, a fog supply pipe connecting the water fog tank and the root accommodating space to each other, and a suction motor pumping the culture medium or the water from the culture tank or the water tank to the water fog tank; a condensation section made up of a condensation pipe having one side connected to the root accommodating space and a cooling fan provided on a side surface of the condensation pipe and performing air cooling on the condensation pipe; ventilating means for causing condensate water to be supplied from the condensation pipe to the water tank; and a control unit made up of a control valve opening and closing the culture tank, the water tank, and the water fog tank and a control box transmitting a control signal to the control valve, the suction motor, and the vibrator. According to the present invention, moisture in discharged excess moisture air is put back into the cultivation chamber main body in a state where the excess moisture air is discharged at regular time intervals, and thus a reduction in root disease frequency can be achieved.본 발명은 수경재배기 및 이를 이용한 물안개 공급방법에 관한 것으로서, 더욱 상세하게는 수경 작물의 뿌리가 수용되는 뿌리수용공간이 구비된 재배실본체, 상기 재배실본체의 상부에 구비되며 내부에 복수 개의 화분이 정렬되는 지지층, 상기 재배실본체의 하부에 구비되