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The invention discloses a water-repellent admixture for mortar and concrete. The water-repellent admixture for mortar and concrete is compounded of organosilicone emulsion, water, a concrete shrinkages reducing agent, a defoaming agent, a water reducing agent, a cement hydrating accelerant, a lithium compound and an air entraining agent, wherein the organosilicone emulsion is of a core-shell structure and prepared by soap-free polymerization and the particle size of emulsion particle is less than 200nm. When 1% of water-repellent admixture is added to mortar, the permeable pressure ratio of the obtained water-repellent mortar layer is not less than 420%, and the water absorption capacity within 48 hours is not greater than 48%; and when 0.2% of water-repellent admixture is added to concrete, the permeable height ratio of the obtained water-repellent concrete layer is not greater than 15%, the water absorption capacity within 48 days is not greater than 26%, and the shrinkage ratio within 28 days is not greater than 102%. The water-repellent admixture contains a core-shell spherical particle polymer with nanoscale and also contains shrinkages reducing agent, air entraining agent, lithium salt and other compounds which have different functions, and thus the anti-permeability, the water-repellent performance and the durability of the water-repellent layer can be greatly improved, the cracking can be avoided, and the toughness is also improved; and the water-repellent admixture is safe, nontoxic, simple in production, environment-friendly, low in cost, simple in structure, and short in open time.

The invention discloses a preparation method of a mortar concrete waterproof agent, which comprises the following steps: preparing an emulsion with an organosilicon core-shell structure by an acrylic acid unsaturated monomer, unsaturated fatty acid and a nonsaturated organosilicone compound through soap-free polymerization, then adding 10-30 parts of water, 2-5 parts of concrete shrinkage reducing agent, 0.2-1 part of antifoaming agent, 5-15 parts of water reducer, 1-3 parts of cement hydration promoter, 10-20 parts of lithium compound and 0.5-1.5 parts of air-entrainer in 40-60 parts of emulsion with an organosilicon core-shell structure in order, and uniformly mixing. According to the invention, a core-shell spherical particle polymer with nano size can be prepared, and the compound containing the shrinkage reducing agent, the air-entrainer and the lithium salt with different functions is composited with the polymer, so that the obtained waterproof agent can greatly enhance the impermeability, waterproofness and durability of a water proof layer, cracking is avoided, toughness is enhanced, construction is simple, the opening time is short, preparation process is safe and nontoxic, production is simple, no environmental pollution is generated, and cost is low.