Polycarboxylic acid high-performance water reducing agent and preparation method thereof

The invention belongs to the technical field of polycarboxylic acid water reducing agent preparation, and discloses a polycarboxylic acid high-performance water reducing agent preparation method, which comprises: mixing a water body and a macromonomer, adding sodium methallyl sulfonate to form a main material, mixing the water body and acrylic acid, adding mercaptopropionic acid and vitamin C to generate a first additive material, and uniformly stirring to obtain a second additive material; a water body and ammonium sulfate are mixed, a main material, a first additive and a second additive are mixed and heated for a polymerization reaction, a molecular weight regulator is added, the molecular weight and distribution of materials in a reaction kettle are regulated, after the polymerization reaction is completed, a Tinaka sodium hydroxide solution is subjected to a neutralization reaction, and the polycarboxylate superplasticizer is obtained. By adding the molecular weight regulator, the molecular weight and th