In order to develop the high-pigment dispersion ink emulsion, 3-Allyloxy-2-hydroxy-1-propane sulfonic acid salt (COPS-1) and 2-acrylamide-2-methylpropanesulfonic acid (AMPS) were used to prepare polymeric emulsifiers and polyacrylate emulsions by Reversible addition fragmentation chain transfer (RAFT) polymerization. The structure and properties of the polymeric emulsifiers were characterized by FT-IR, GPC and critical micelle concentration analysis. The influence of RAFT agent dosage, hydrophilic monomer ratio of polymeric emulsifier, hydrophilic monomer amount on the properties of emulsions and coating films were investigated, which revealed that the polymer emulsifiers prepared by RAFT polymerization have good emulsifying properties and narrow molecular weight distribution. The optimal amount of RAFT reagent is 0.6% of the monomer amount, the optimal ratio of the hydrophilic monomer is m(COPS-1)∶m(AMPS)∶m(AA)=1∶2∶3, and the optimal acid amount is 25%. Analysis of the glass transition temperature and particle morphology of the emulsion shows that the latex particles have two glass transitions and are uniformly dispersed.