Provided is a method for manufacturing an aromatic azo compound that is excellent in manufacturing efficiency and yield.The method for manufacturing an aromatic azo compound includes obtaining an azoxy compound by heating a mixture containing nitrobenzenes, an aldose, and an alkaline substance to a temperature of 25° C. to 50° C. under an alkaline condition, and then manufacturing an aromatic azo compound by further heating the mixture, in which the azoxy compound is generated, to a temperature higher than 50° C.