Dyeing promoter of acrylic fiber cationic dye and application thereof

The invention discloses a dyeing promoter of an acrylic fiber cationic dye. The dyeing promoter consists of benzoic alcohol, butyl acetate, a compound emulsifier and water, wherein the volume ratio of the benzoic alcohol to the butyl acetate to the compound emulsifier to the water is 10:10:1-2:78-79. The dyeing promoter of the acrylic fiber cationic dye can improve the dye-uptake of the lower temperature dyeing of the acrylic fibers with the cationic dye, and ensures high color fastness of dyed textile and small strength loss of fibers.