The invention discloses a method for preparing polyphenylene sulfide from benzene and sulfur. The method comprises the following steps: (1) sequentially adding a solvent and an inorganic salt catalystinto a reaction kettle, starting to stir, adding sulfur, continuously stirring until uniform suspension liquid is formed in the reaction kettle; (2) adding benzene into the suspension liquid, adjusting the temperature in the reaction kettle to 60-100 DEG C, and reacting at a constant temperature for 0.5-1.5 hours; (3) adjusting the temperature in the reaction kettle to 120-170 DEG C, and reactingat a constant temperature for 2-6 hours; (4) adjusting the temperature in the reaction kettle to be lower than 40 DEG C, and carrying out solid-liquid separation, so as to obtain a polyphenylene sulfide resin crude product; and (5) washing and drying the polyphenylene sulfide resin crude product, so as to obtain the polyphenylene sulfide resin. According to the method, amorphous polyphenylene sulfide resin is synthesized through the reaction of benzene and sulfur, so that the problem that existing polyphenylene sulfide is difficult to be processed into a film or a fiber due to the high crystallization degree is solved; and production purify is high, the solvent is easy to recycle, the production cost is low, and the ''three wastes'' are remarkably reduced.