The invention aims to solve the problem that existing 
irrigation is not energy-saving enough, and discloses an energy-saving 
irrigation device for water conservancy projects. The energy-saving 
irrigation device comprises a first fastening screw, a first ejector rod, a first supporting frame, a first bottom plate, a first rocking 
handle, a first 
lantern ring, a first rotating shaft, a first 
rotating disc, a positioning frame, a liquid outlet 
pipe, a sleeve, a supporting plate, a rack, a first motor, a 
rotating disc, a first rack, a second rack, a sliding rod, a guide groove, a spiral spring, afirst connecting ring, a mounting plate, a connecting bag, a second connecting ring, a pull 
rope, a second 
rotating disc, a second 
lantern ring, a second rotating shaft, a second rocking 
handle, a second supporting frame, a second fastening screw, a second ejector rod, a second bottom plate, a hammer block, a second motor, a first roller, teeth, a chain and a fourth rotating shaft. By moving a watering pipeline and detecting the 
hardness of the ground, the 
staying time of the device can be conveniently controlled according to terrains with different 
hardness, the watering amount is controlled,and therefore reasonable irrigation is conducted, and more energy is saved.