High alkali-resistant black disperse dye

The invention discloses a black disperse dye with high alkali resistance, and belongs to the technical field of fine chemical engineering. The method comprises the following steps: preparing arylamine diazonium salt by taking primary arylamine as a diazonium component, and carrying out coupling reaction on the arylamine diazonium salt and an aminonaphthol compound under an acidic condition to prepare the monoazo disperse dye; and carrying out coupling reaction on the prepared monoazo disperse dye serving as a coupling component and another diazonium salt under an alkaline condition to prepare the bisazo disperse dye. The obtained disperse dye is a single component and can be used under the condition of 0.5-5 g/L NaOH, when the use amount of the dye is larger than or equal to 8%, the blackness of dyed fabric is extremely high (-0.5 < a * < 0.5,-1.0 < b * < 1.0 and L * < 17), and the disperse dye has good color fastness and can be used for short-process dyeing and finishing of polyester and blended fabric there