A power cable comprising: a conductor; an inner semi-conductive layer covering the conductor; an insulating layer covering the inner semi-conductive layer and impregnated with an insulating oil; an outer semi-conductive layer covering the insulating layer; a metal sheath layer covering the outer semi-conductive layer; and a cable protective layer covering the metal sheath layer, wherein the insulating layer is formed by sequentially stacking an inner insulating layer, an intermediate insulating layer, and an outer insulating layer, characterized in that the inner insulating layer and the outer insulating layer are formed by cross-winding kraft paper by gap winding and impregnating the kraft paper with the insulating oil, the intermediate insulating layer is formed by cross-winding semi-synthetic paper by gap winding and impregnating the semi-synthetic paper with the insulating oil, the semi-synthetic paper including a plastic film and kraft paper stacked on at least one side of the plastic film, the gap winding is performed by cross-winding a kraft paper or semi-synthetic paper to form regular gaps between the widths of the kraft paper or semi-syntehtic paper, and repeatedly cross-winding a new kraft paper or semi-synthetic paper on the kraft paper or semi-synthetic paper to cover the gaps with the new kraft paper or semi-synthetic paper while gaps are formed between the widths of the new kraft paper or semi-synthetic paper, the intermediate insulating layer is divided into at least two layers (320a, 320b) according to a width of the semi-synthetic paper thereof, wherein, when a layer more adjacent to the conductor among the at least two layers is a lower layer and a layer located at an outer side of the lower layer is an upper layer, the width of the semi-synthetic paper forming the upper layer is greater than that of the semi-synthetic paper forming the lower layer, a width of the gaps between the widths of the semi-synthetic paper, which are formed by gap-winding the semi-synthetic paper, is 5 to 15% of that of the semi-synthetic paper, and layers cross-wound a plurality of times in an S direction and layers cross-wound a plurality of times in a Z direction are alternately included in the insulating layer, and the intermediate insulating layer comprises at least two layers cross-wound in the S direction or the Z direction. a conductor; an inner semi-conductive layer covering the conductor; an insulating layer covering the inner semi-conductive layer and impregnated with an insulating oil; an outer semi-conductive layer covering the insulating layer; a metal sheath layer covering the outer semi-conductive layer; and a cable protective layer covering the metal sheath layer, wherein the insulating layer is formed by sequentially stacking an inner insulating layer, an intermediate insulating layer, and an outer insulating layer, characterized in that the inner insulating layer and the outer insulating layer are formed by cross-winding kraft paper by gap winding and impregnating the kraft paper with the insulating oil, the intermediate insulating layer is formed by cross-winding semi-synthetic paper by gap winding and impregnating the semi-synthetic paper with the insulating oil, the semi-synthetic paper including a plastic film and kraft paper stacked on at least one side of the plastic film, the gap winding is performed by cross-winding a kraft paper or semi-synthetic paper to form regular gaps between the widths of the kraft paper or semi-syntehtic paper, and repeatedly cross-winding a new kraft paper or semi-synthetic paper on the kraft paper or semi-synthetic paper to cover the gaps with the new kraft paper or semi-synthetic paper while gaps are formed between the widths of the new kraft paper or semi-synthetic paper, the intermediate insulating layer is divided into at least two layers (320a, 320b) according to a width of the semi-synthetic paper thereof, wherein, when a layer more adjacent to the conductor among the at least two layers is a lower layer and a layer located at an outer side of the lower layer is an upper layer, the width of the semi-synthetic paper forming the upper layer is greater than that of the semi-synthetic paper forming the lower layer, a width of the gaps between the widths of the semi-synthetic paper, which are formed by gap-winding the semi-synthetic paper, is 5 to 15% of that of the semi-synthetic paper, and layers cross-wound a plurality of times in an S direction and layers cross-wound a plurality of times in a Z direction are alternately included in the insulating layer, and the intermediate insulating layer comprises at least two layers cross-wound in the S direction or the Z direction.