Plate-like single-crystalline BaBi₄Ti₄O15 particles were synthesized by the molten salt synthesis (MSS) method. The effects of sintering temperature, holding time, and NaCl–KCl molten salt content on the phase structure and morphology of plate-like BaBi₄-Ti₄O15 particles were investigated. The results show that plate-like BaBi₄Ti₄O15 particles can be synthesized when the sintering temperature is above 800∘C. The size of particles increases with increasing sintering temperature and molten salt content. Largely anisotropic plate-like BaBi₄Ti₄O15 particles with diameter ≥10μm and thickness of ∼0.3 μm can be obtained under the optimum process parameters. The crystal structure of BaBi₄Ti₄O15 was determined as A2₁am by TEM, which should be attributed to the Bi3+ and Ba2+ diffusing into [TiO₆] octahedrons.