Auxiliary device for plant growing and water retaining in arid region

The invention discloses an auxiliary device for plant growing and water retaining in an arid region. The device comprises a conservation cylinder, a first isolation frame, a second isolation frame, a first soilless culture substrate, a second soilless culture substrate, a third soilless culture substrate and a conservation cover, wherein the conservation cylinder is composed of an outer layer and an inner layer, and the inner layer is attached to the inner wall of the outer layer; in use, the first soilless culture substrate, the second isolation frame, the second soilless culture substrate, the first isolation frame and the third soilless culture substrate are placed in the conservation cylinder from bottom to top in sequence; plant seeds are scattered in the third soilless culture substrate, and a cylinder opening of the conservation cylinder is covered with the conservation cover. The device has heat insulation, water retaining and soil moisture preserving functions, can provide nutrients required by growt