The present invention relates to a nutrient solution supply device of crops cultivated in a greenhouse, which supplies a nutrient solution at the temperature for minimizing stress of crop roots cultivated when supplying a nutrient solution to crops cultivated in a greenhouse, and maximizes harvests as well as promotion of crop growth. The nutrient solution supply device of crops cultivated in a greenhouse comprises: a raw water tank which has a temperature adjusting means for adjusting the temperature of water and a water level adjusting means installed therein； a nutrient solution device which receives raw water from the raw water tank and liquid fertilizers from a liquid fertilizer tank, and mixes the raw water with the liquid fertilizer； and a nutrient solution supply means which receives a nutrient solution from the nutrient solution device to supply the same to crops cultivated in a crop cultivating means. The nutrient solution supply means has a nutrient solution supply pipe connected to the nutrient solution device and having a filter and a flowing meter installed in one side thereof. A plurality of nutrient solution branch pipes having a valve installed thereto are installed in an end portion of the nutrient solution supply pipes. A plurality of columns of nutrient solution supply local pipes are installed in an end portion of each nutrient solution branch pipe, and in a rear end portion of each nutrient solution supply local pipe, installed is a nutrient solution drainage pipe through which a nutrient solution staggered in the nutrient solution supply local pipes is discharged when exceeding a target temperature. In a discharging side of the nutrient solution supply local pipe or any one side of the nutrient solution drainage pipe, installed is a temperature sensor which senses whether the temperature of a nutrient solution in the nutrient solution supply local pipe or the nutrient solution drainage pipe exceeds or falls short of the target temperature.본 발명
