Polycarboxylate cement grinding aid and preparation method thereof

The invention discloses a polycarboxylate cement grinding aid and a preparation method thereof. The preparation method comprises the following steps of: performing copolymerization on comonomers in aqueous solution in the presence of an initiator to obtain a polymer A, wherein the comonomers comprise ether monomers, amine monomers and carboxylic acid monomers; and adding a small amount of alcamines substance B into the polymer A to obtain the polycarboxylate cement grinding aid. The grinding aid has the advantages of obviously improving grinding efficiency and greatly improving cement strength, along with simple production method and environmental protection.