The invention relates to the technical field of desert control, and discloses a desert soil improver. The desert soil improver comprises a solid fertilizer and fog collection cotton, wherein the fog collection cotton is partially embedded in the solid fertilizer and partially exposed to the outer portion of the solid fertilizer, and the solid fertilizer is a water-soluble solid fertilizer. The invention further discloses a method for desert control. The method for the desert control comprises the steps of (1) preparation of the desert soil improver, wherein the solid fertilizer and the fog collection cotton are placed in a mold to prepare the desert soil improver; (2) spreading of the desert soil improver, wherein the desert soil improver is spread on sandy soil and mixed with the sandy soil, and part of at least one piece of the fog collection cotton in the desert soil improver is exposed on the surface of the sandy soil. The desert soil improver and the method for the desert controlsolve the problem of water and fertilizer retention of deserts, thereby achieving the desert control.