The invention provides a synthetic method for symmetrical diaryl disulfide, which relates to the fields of organic chemical industry and fine chemical engineering. The method uses arylboronic acid and elemental sulfur powder as raw materials and a metallic copper salt as a catalyst; a reaction is carried out under the conditions of heating and stirring, and reaction time is 5 to 8 h; a mol ratio of arylboronic acid to elemental sulfur is 1: 1.5, the usage amount of the Cu catalyst is 5% of the mol fraction of the arylboronic acid, and an excellent effect is obtained when the raw materials react with the catalyst at a temperature of 50 to 80 DEG C for 5 to 8 h under stirring and heating. According to the invention, the inorganic substance, elemental sulfur, is used as a sulfur source, elemental sulfur and safe low-toxicity arylboronic acid undergo a coupling reaction to directly introduce an inorganic non-metallic element into an organic molecule, so greenness of synthetic route is realized; the reaction is easy to operate, the usage amount of the catalyst is small, the synthetic method is superior to other synthetic methods in the prior art, synthesized symmetrical diaryl disulfide is easy to separate, and good environmental protection performance is obtained.