A method for manufacturing a separable electromagnetic inductive apparatus is provided. The method for manufacturing a separable electromagnetic inductive apparatus comprises a winding step for winding a steel plate composed of a rolled amorphous magnetic alloy to a circular shape to form a magnetic core; a heat treating and an impregnating step for heat treating and impregnating the wound magnetic core without adding cobalt; a cutting step for cutting the heat treated and impregnated magnetic core to an orthogonal direction to the wound direction of the magnetic core; and a polishing step for polishing the cut surface having a three-dimensional plane of the cut surface of the magnetic core evenly arranged in a fixed state.