The invention discloses a carbon dioxide cured prefabricated water-permeable concrete and a preparation method thereof. The water-permeable concrete is composed of following components in parts by weight: 55 to 80 parts of regenerated aggregate, 7 to 30 parts of nickel slag sand, 18 to 40 parts of cementing material, 5 to 25 parts of water, 0.01 to 2 parts of naphthalene water reducer, 0 to 0.02 part of cellulose ether, and 0 to 0.01 part of welan gum. The cementing material is composed of following components in parts by weight: 70 to 90 parts of common silicate cement, 5 to 15 parts of fly ash, 10 to 30 parts of steel slag, 5 to 15 parts of lime or lime slag, and 0.02 to 1 part of nano calcium carbonate. The technology is simple, the structure advantage of water-permeable concrete and the properties of industrial byproducts such as nickel slag, steel slag, fly ash, and the like are fully utilized; carbon dioxide curing is utilized to realize rapid, efficient and environmentally friendly production; high strength, durable and water permeable concrete is obtained, the energy consumption is reduced, the industrial tail gas, metallurgy slag, and building waste are effectively utilized, and good economic benefits, social benefits, and environmental benefits are generated.