The invention belongs to the field of building materials, and specifically relates to a concrete curing compound and a preparation method thereof. According to the concrete curing compound and the preparation method thereof, sepiolite, nanosilicon dioxide and nanotitanium dioxide are used as raw materials; through ball grinding mixing and acidification and sulfonation treatment of concentrated sulfuric acid, the dispersing performance of particles is improved; in addition, by use of the natures that the sepiolite is softened in water and is high in permeability, the sepiolite is remodified under the atmosphere of sodium hydroxide and under the environment of ferrous ions and ferric ions; by deposition of ferrous iron and iron, the adsorption performance of the particles is improved, so that pores are combined and filled with the particles more easily, and the anti-seepage performance is improved; then, succinic acid and ethidene diamine are used as raw materials, and ions are used as aguide agent, so that an organic complex is formed; through combination of the organic complex and calcium ions and blocking of capillaries inside concrete, the whiskering phenomenon is effectively prevented.