The invention discloses an active yellow dye and preparation and application thereof. The active yellow dye has a structure shown in formula (I). The active yellow dye has the advantages that the structure of monomer compound is novel, the property is excellent, the color fixation rate is good, and the color fastness rate is high; the stability is realized, the washing-resistant, abrasion-resistant and sun exposure-resistant property are good, and the binding stability with fibers is good; during dyeing, the usage amount of water is reduced, the dying duration is short, the consumption of energy sources is decreased, and the usage amount of salt is reduced; a finished product has excellent colorful degree, the production cost is low, and the active yellow dye can be popularized and applied in a large scale way.