The invention discloses a compound active dark-red dye as well as a preparation method and application thereof. The dye comprises the following ingredients in parts by weight: 30-80 parts of a compound shown in the formula (1), 10-30 parts of a compound shown in the formula (2) and 10-40 parts of a compound shown in the formula (3), wherein R1 is -H, -OCH3 or -SO3H, and M is an alkali metal ion. The compound active dark-red dye has the properties of good stability, high upgrade rate, solubility and color fixation, and excellent dyeing synchronicity, level dyeing and color reproducibility, particularly has relatively high light fastness, outstanding deep dyeing property and oxygen bleaching resistance property and other favorable properties, and is suitable for printing and dyeing of cellulose fiber materials, particularly cotton, cotton/polyester and the like.