The invention provides a composition of disperse black dyes, which mainly comprises one or a plurality of components A, the structures of which are shown as the formula (I), one or a plurality of components B, the structures of which are shown as the formula (II), one or a plurality of components C, the structures of which are shown as the formula (III) and one or a plurality of components D, the structures of which are shown as the formula (IV). The composition of the disperse black dyes of the invention, after merchandizing treatment, can be provided for dyeing at liquid state or cream state after being corpuscular or at powder state and granule state after being dried by a spray drying method. When hydrophobic fiber materials are dyed with dyestuff prepared by the composition of the disperse black dyes of the invention, black dyed fabric with excellent washing fastness and well performed sun-proofness and perspiration-proofness can be obtained by adjusting the proportion among different components. The composition of the invention is particularly applicable to the printing and dyeing of medium-high grade plus materials such as superfine denier fabric and the blend fabric of polyester/cotton and polyester/ammonia.