The present invention provides a water-saving irrigation device, which mainly sends and receives an ultrasonic wave through a distance detection device and calculates the time from when the ultrasonic wave is sent to received to calculate the detection distance between the distance detection device and a detection object. Then, by determining the length of the detection distance, the electromagnetic water valve is controlled to be opened or closed, thereby achieving the purpose of saving water resources.本新型提供一種節水澆灌裝置，其主要係透過距離偵測裝置發送、接收一超聲波並計算超聲波發出至接收的時間，以計算出該距離偵測裝置與一偵測物之間的偵測距離，再透過判斷該偵測距離的長短以控制電磁水閥開啟或關閉，進而達成節省水資源的目的。
