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In the process of titanium microalloyed steel continuous casting, tiny TiN can refine solidification structures, while thick TiN will affect casting. In this paper, the experimental results showed that electropulsing could refine the size of TiN precipitates and improve the nucleation rate of the TiN precipitates. The larger electropulsing intensity resulted in a better effect. The modelling results showed that electropulsing could reduce the nucleation barrier of TiN in the molten steel and the two-phase region. In addition, the larger the electropulsing intensity and the higher the temperature, the better the promotion effect is. This research is of great significance for solving the problem of nozzle clogging and solidification microstructure refinement of titanium microalloyed steel.