PROBLEM TO BE SOLVED: To provide a greenhouse cultivation system for properly adjusting a plant raising environment in a greenhouse by using exhaust gas containing carbon dioxide discharged from a piece of combustion apparatus using hydrocarbon as fuel.SOLUTION: This greenhouse cultivation system includes an exhaust gas flow path 21 supplying exhaust gas 11b from a combustion apparatus 11 to plants in a greenhouse space 2b. A latent heat collection heat exchanger 22 cooling the exhaust gas 11b by cooling water 23a and a drain collecting part 22a collecting drain produced with the latent heat collection heat exchanger 22 are each provided so as to control the temperature of the cooling water 23a to be supplied to the latent heat collection heat exchanger 22 based on humidity in the greenhouse space 2b.
