A hydroponic system comprises: a housing; a cultivation stand arranged inside of the housing, forming an inner space, and comprising a plurality of insertion holes; a holder having closed lower and side parts, having an opened upper part, inserted into at least a lower insertion hole so as to be supported, and comprising a plurality of through-holes in the lower surface and/or the side surface so as to allow a nutrient solution to infiltrate therein; a roll member made of a nonwoven fabric, inserted and supported within the holder, and wound in a roll shape so as to support crops between the winding surfaces; and a nutrient solution supplier for passing the nutrient solution through the through-holes of the holder and supplying the same to at least the lower part of the roll member.
