Synthetic method for disperse azo dyes

The invention belongs to the chemical field of dyes, and solves a problem that much acid wastewater is produced in a production process of disperse azo dyes. The invention discloses a synthetic method for disperse azo dyes, and the synthetic method comprises the following steps of: separating out coupling components, dispersing coupling components, carrying out diazotization and coupling reaction; dosage of acid can be greatly reduced in a production process; under the condition of ensuring dye quality, so that not only is production cost lowered, but also wastewater treatment pressure is relieved, and therefore, unification of environmental benefits and economic benefits is realized better.