Agriculture water and soil improvement irrigation and drainage system

The invention relates to an agriculture water and soil improvement irrigation and drainage system. The building process of the system is as follows: saline and alkaline land is leveled, pipe ditches are dug along the surface slope in the fields, the ditch slope is 0.5-5%, the ditch space is 10-30m, the ditch width is 10-60cm, the depth is 50-200cm, 5-10mm fine sand is paved on the bottoms of the ditches, the hard pipe diameter is 10-30cm, pipe bodies are punched, the hole diameter is 2-5mm, and gaps account for 2-10% of superficial areas of the pipe bodies; 2-5 layers of permeable geotextiles are used for covering the outer sides of the pipe bodies, hard pipes are placed in the ditches in which cushions are placed, one ends, located at the high terrain, of the hard pipes are 20-30cm higher than the ground, pipe heads are capped, sundries are prevented from entering the pipes, 10-30cm of the 5-10mm fine sand is filled in the hard pipes paved in the ditches, pipe bores are prevented from being blocked, and the ditches are filled, leveled up and compacted by using soil. By using the drainage system, the drainage efficiency is high, the desalting efficiency is obviously improved, the controllability of the technology is enhanced, a trickle irrigation localized irrigation technique is fully exerted, water can be greatly saved, the floor area of the drainage system is reduced, and the desalting efficiency is improved.