Aminonaphthol type bisazo heterocyclic disperse dye

The invention discloses an aminonaphthol type bisazo heterocyclic disperse dye, and belongs to the technical field of fine chemical engineering. The preparation method comprises the following steps: preparing heterocyclic aromatic amine diazonium salt by taking a heterocyclic aromatic primary amine derivative as a diazonium component, and carrying out coupling reaction on the heterocyclic aromatic amine diazonium salt and an aminonaphthol compound under an acidic condition to prepare the aminonaphthol type monoazo heterocyclic disperse dye; and carrying out coupling reaction on the prepared monoazo heterocyclic ring disperse dye serving as a coupling component and another diazonium salt under an alkaline condition to prepare the aminonaphthol type bisazo heterocyclic ring disperse dye. The aminonaphthol type bisazo heterocyclic ring disperse dye obtained by the invention can be used under the condition of 0.5-5g/L NaOH, has better color fastness, and can realize short-process dyeing and finishing processing o