This study investigates the effect of different concentrations of lanthanum chloride (Ce₂(SO₄)₃) on the grain refinement of nickel deposition layers during the electrochemical deposition process in industrial electrolytes. The impact of different (Ce₂(SO₄)₃) concentrations on nickel electrodeposition behavior was analyzed using the Liner sweep voltammetry curve (LSV), Cyclic voltammetry curve (CV) and Chronoamperometry curve (CA). The microstructure morphology and grain size of the deposition layers were analyzed u-sing scanning electron microscopy and the preferred orientation and crystal structure were analyzed using X-ray diffraction. The results show that the addition of different concentrations of (Ce₂(SO₄)₃) to the industrial electrolyte leads to a negative shift in the starting deposition potential of nickel, an increase in cathode polarization degree, an increase in overpotential, a shortened nucleation relaxation time tm and an accelerated nucleation rate during nickel electrodeposition, resulting in grain refinement of the deposition layers.