Rainwater-collecting, water-retaining and desertification-controlling device for plants and using method thereof

The invention belongs to the technical field of water saving and desertification control, and particularly relates to a rainwater-collecting and water-retaining desertification control device for plants and a using method of the rainwater-collecting and water-retaining desertification control device. The desertification control device comprises a Y-shaped funnel-shaped water collecting tank body, an inserting box is arranged in the water collecting tank body in a penetrating manner; the top of the insertion box is of an open structure, and the insertion box is filled with a water absorption filling layer. A plurality of communicating holes communicating inside and outside are formed in the side wall of the inserting box or the inserting box is made of a sieve plate. When plants are planted in the sand land, a plurality of desertification control devices are buried in the sand land, so that the plurality of desertification control devices are encircled to form a square-frame-shaped plant planting area, and the