The product is a water-soluble superplasticizer mother liquor with carboxylic acid base material grafted with high polymer as the main body. For different strength grades of concrete can be deployed with high water reduction rate, high slump, high workability, high strength, low shrinkage of water reducing agent finished products. The finished product is especially suitable for the preparation of high-performance concrete with high strength, high flow state, self-compacting and high durability.