The invention relates to active dye composition in dark blue to black and a dye product. The dye composition comprises, in parts by weight, 45-95 parts of a component A, 5-55 parts of a component B and 0-40 parts of a component C, wherein the component A is selected from at least one compound represented by the formula (I), the component B is selected from at least one compound represented by the formula (II), and the component C is selected from at least one compound represented by the formula (III) and/or the formula (IV). The active dye product in dark blue to black comprises the dye composition. The dye product is good in deep dyeing property, excellent in improvement power, high in dye up-take, high in color fixation, good in compatibility and excellent in color fastness; during dyeing, the dye is small in use amount, easy to wash, clear in residual liquid, stable in salt and alkali resistance, excellent in metamerism, stable in dyeing property and applicable to different technologies of dip dyeing, pad dyeing, printing and the like.