Environment-friendly cement grinding aid and preparation method thereof

The invention discloses an environment-friendly cement grinding aid and a preparation method thereof, relates to the technical field of cement grinding aids, and aims to solve the problem that the preparation process of the existing cement grinding aid does not accord with environment-friendly green production. The environment-friendly cement grinding aid comprise the following components in partsby weight: 20-40 parts of wheat straw alkali lignin, 1-4 parts of an oxidizing agent, 1-4 parts of a polar additive, 8-16 parts of polyglycerol fatty ester, 6-12 parts of polyglycerol, 6-12 parts ofglycerin-like compound, 1-5 parts of polyether polyhydroxy tertiary amine, 5-15 parts of ethylene glycol, 2-8 parts of propylene glycol, 1-5 parts of sodium hydroxide and 15-40 parts of water; whereinthe oxidizing agent is one or a combination of more of ammonium persulfate, potassium permanganate, hydrogen peroxide and sodium hypochlorite; and the polar additive is one or a combination of more of polyvinyl alcohol, sodium