The invention discloses a novel soil amendment and a preparation method thereof. The novel soil amendment is prepared from the following raw materials: straw, attapulgite, novel composted manure, kitchen waste garbage, eggshells and horse dung fungus. The preparation method comprises the following steps: (1) crushing the straw, and grinding the straw into powder; (2) crushing the kitchen waste garbage, and adding water to obtain garbage slurry; (3) uniformly mixing the attapulgite and the eggshells, and crushing the mixture into powder by utilizing a grinding machine; (4) pouring products obtained in step (1), step (2) and step (3) into a same container, adding the horse dung fungus and the novel composted manure, and ultrasonically treating to obtain a mixed material; and (5) adding earthworms into the mixed material, and culturing for 26 to 30 days at the normal temperature and normal pressure. By adopting the novel soil amendment prepared by the invention, the performance of the soil can be apparently improved, the oxygenation efficiency is high, the oxygenation amount is high, the breathability is improved, a necessary oxygen condition can be provided for the growth of plants,the growth and culture of organisms in the soil can be facilitated, and the survival rate of seedlings can be greatly improved.