The invention relates to a solvent recycling technology adopted in polyphenylene sulfide production. According to the technology, sodium sulfide and paradichlorobenzene which contain a certain amount of crystallization water are adopted as raw materials, lithium chloride is adopted as cosolvent, and N-methyl pyrrolidone is adopted as solvent, so that polyphenylene sulfide resin is synthecized; after a polycondensation reaction is completed, the solvent for synthesizing and producing the polyphenylene sulfide resin is recycled, meanwhile, a certain amount of fresh NMP solvent and oxygen-free deionized water need to be added to a polycondensation reaction system to dissolve the cosolvent and a by-product (sodium chloride) generated in the synthesis technological process, thereby a mixture system containing the polyphenylene sulfide resin, NMP, the cosolvent, the by-product and organic impurities is formed, and immediately the mixture system is input into a centrifugal machine for solid-liquid separation. According to the solvent recycling technology, the high boiling point solvent and the oxygen-free deionized water are adopted as diluent of the polycondensation reaction system, and the solvent recycling technology aims at lowering the viscosity of the polycondensation reaction system, raising the velocity of solid-liquid separation, further raising the production rate of the polyphenylene sulfide resin, lowering production cost of whole polyphenylene sulfide resin, shortening the washing process flow at the same time and reducing equipment investment of the washing process flow.