Method of manufacturing a grain-oriented electrical steel sheet according to one embodiment of the present invention in weight%, Si: 2 to 7%, and Sn: 0.03 to 0.10% and Sb: the steel slab comprises at least one of 0.01 to 0.05% a step of producing; Preparing a hot-rolled sheet by hot rolling a steel slab; To prepare a cold-rolled sheet by cold rolling the hot-rolled sheet; Further comprising: a cold-rolled sheet annealed primary recrystallization; The method comprising applying and drying an annealing separator to the primary recrystallization annealing the cold-rolled sheet; And an annealing separator comprising the step of annealing the secondary recrystallization the coated cold-rolled sheet.
After primary recrystallization annealing, the thickness of the oxide layer formed on the surface of the cold-rolled sheet is 0.5 to 2.5 ㎛, the amount of oxygen of the oxide layer in the step of annealing the primary recrystallization is at least 600 ppm, and annealing the secondary recrystallization, forsterite (Mg ₂ SiO ₄₎ can be removed coating.