The invention discloses an irrigation system for three-dimensional greening walls. The irrigation system comprises a water supply portion, a water storage portion, a detection portion and a control portion the water supply portion supplies irrigation water the water storage portion is used for storing at least a part of the irrigation water supplied by the water supply portion the detection portion is used for detecting the water quantity of the water stored by the water storage portion the control portion selectively controls the water supply portion to supply the water or stop supplying the water according to the water quantity detected by the detection portion. The irrigation system has the advantages that the three-dimensional greening walls can be automatically irrigated, labor is saved, the irrigation water for the three-dimensional greening walls can be monitored in real time, and the water utilization rate can be increased.
