Belonging to the technical field of acrylic fiber manufacturing, the invention in particular relates to an acrylic pigment slurry, a preparation method and application thereof. The method provided by the invention adopts a coupling agent and an acrylic spinning solution to cooperate with a dispersion agent to treat pigment, thus obtaining the pigment slurry, which can be applied to preparation of dope dyed acrylic fiber. The preparation method involved in the invention is simple, the prepared pigment slurry has good dispersion stability, and the dope dyed acrylic fiber prepared from the pigment slurry has high color fastness.