Preparation method of polyarylene sulfide

A process for preparing a polyarylene sulfide, comprising:

• a first step of preparing a sulfur source comprising dehydrating a hydrosulfide of an alkali metal and a hydroxide of an alkali metal in the presence of an organic acid salt of an alkali metal in a mixed solvent of water and an amide-based compound;
• and
• a second step of preparing a polyarylene sulfide by adding a dihalogenated aromatic compound and an amide-based compound to a reactor containing the sulfur source and performing a polymerization reaction;
• wherein the amide-based compound added in the second step is added in an amount of 1.0 to 2.0 equivalents based on 1 equivalent of the hydrosulfide of an alkali metal in the second step, and a molar ratio of water to the amide-based compound present in the polymerization reaction system of the second step is 0.5 to 0.85, and
• wherein the sulfur source prepared in the first step contains 25% (v/v) to 35% (v/v) of the amide-based compound based on a total volume of the mixed solvent of water and amide-based compound.