The invention discloses a novel light-catalyzed sulfur-oxygen-magnesium sanded floor. The sanded floor comprises two sanded floors and a fixed top plate, wherein rectangular grooves are formed in oneends, far from each other, of the two sanded floors, screw columns are arranged in the rectangular grooves, and pushing blocks are arranged on the side surfaces of the screw columns; sliding blocks are arranged on the bottom sides of the fixed top plate and are connected with the bottom sides of the rectangular grooves in a sliding manner, and the fixed top plate is ejected to the pushing blocks;cavities are formed in the sanded floors, ultraviolet lamps are arranged in the cavities, and triangular grooves are formed in the sanded floor in an array manner; and the sanded floors are smeared with a photosynthetic catalyst, and the ultraviolet lamps are located below the photosynthetic catalyst. The novel light-catalyzed sulfur-oxygen-magnesium sanded floor can be finely adjusted and fixed,so that the wasting is avoided, the mounting is facilitated, meanwhile, mineral substances generated on the catalyst due to the accumulation is avoided, the passivation of a photocatalyst is prevented, and the durability of the photocatalyst is not influenced.