The invention belongs to the technical field of dispersant preparation, and discloses an acrylate polymeric dispersant as well as a preparation method and an application thereof. The acrylate polymeric dispersant is prepared from methyl methacrylate and N-(3-dimethylamino propyl) methacrylamide in an RAFT polymerization method. The synthesis method comprises the following steps: generating an RAFT reagent molecule from a monomer methyl methacr (or N-(3-dimethylamino propyl) methacrylamide) under the action of an initiator and an RAFT reagent under an oxygen-free condition; and reacting with the monomer methyl methacr (or N-(3-dimethylamino propyl) methacrylamide) under abduction of the initiator to generate the acrylate polymeric dispersant. The acrylate polymeric dispersant is good in covering and encapsulation effects on an organic particle surface, and stable in dispersion system, and is mainly applied to dispersion of ceramic pigment particles for ceramic ink jetting.