The utility model relates to a seedling planting protects water installation in underground for arid area, including nursery stock hole, the bottom in nursery stock hole covers one deck bao shui and holds back cloth, and this baoshui holds back cloth and forms an upper end open -ended cavity, bao shui holds back along lieing in on the cavity that cloth formed the middle part in nursery stock hole,the inner edge bottom surface of this cavity and the even interval of lateral wall are fixed with a plurality of guarantor's water bags, guarantor's water bag embeds there is the water retaining agent, protecting the water bag and including the surrounding layer, the even system has a plurality of holes of permeating water in this surrounding layer, surrounding layer inlayer system has one deck slowly -releasing membrane, in this slowly -releasing membrane there is the holding the water retaining agent, every is the volume of protecting the interior water retaining agent of water bag 0.1% ofslowly -releasing membrane internal volume 2%.