Irrigation system based on water-saving agriculture

The invention belongs to the technical field of agricultural irrigation, and particularly relates to an irrigation system based on water-saving agriculture. The irrigation system comprises machine bodies, floating blocks, sliding blocks, water inlets, water outlets, spraying holes and water pipes; each machine body is of a hollow structure; the number of the machine bodies is four; the four machine bodies are arranged in a rhombus shape; the floating blocks are connected to the interiors of the machine bodies with the hollow structures in a sleeving mode; the upper portions of the floating blocks are filled with water, and the lower portions of the floating blocks are filled with temperature sensing media; the sliding blocks are fixed to the sides, away from the temperature sensing media, of the floating blocks; and the sliding blocks are connected with the inner walls of the machine bodies in a sleeving mode. The temperature sensing media filled in the machine bodies expand after being heated to drive the fl