▎ 摘　　要

NOVELTY - Preparing lignin additive comprises using lignin as the starting material, adding sulfonating agent for sulfonation reaction, adding sodium aminobenzene sulfonate and diaminobenzidine for condensation reaction, adding graphene oxide and polyethylene glycol to react and stir and adjusting pH value to 10-12 with alkali to obtain lignin additive. USE - The method is useful for preparing lignin additive. ADVANTAGE - The lignin additive has good dispersibility and stability, has small doping amount, excellent dispersibility and good slurry stability.