The invention provides a method for solvent method centralized sulfonation separate type condensation production of a naphthalene water reducer. The method includes the steps of putting, sulfonation, dehydration, hydrolysis, condensation, neutralization and the like. By adopting a low acid blending amount for sulfonation, no disulfonic acid or polysulfonic acid is generated, the selectivity of beta-naphthyl sulfonic acid is improved, the quality of the water reducer is improved, and the emission of waste residues is reduced; solvent is used in the sulfonation process, the water outlet amount serves as the reaction endpoint target value, the solvent amount for each time of dehydration is gradually reduced, the solvent use amount is reduced to the maximum, and thus the heat loss is reduced; a large-volume reaction kettle is adopted for centralized sulfonation, reaction released heat is fully utilized, the temperature of the reaction kettle is kept, and the steam use amount is reduced; the emission of waste gas is reduced; condensation is carried out without pressure, and thus safety is high.