A submarine cable, comprising: a submarine cable section which comprises a first conductor, wherein the first conductor comprises n first monofilament layers sequentially arranged from inside to outside in a radial direction of the submarine cable; and a landing cable section which comprises a second conductor, wherein the second conductor comprises m second monofilament layers sequentially arranged from inside to outside in the radial direction of the submarine cable, and the m second monofilament layers are sequentially divided from inside to outside in the radial direction of the submarine cable into n second welding monofilament layers and h second winding monofilament layers, wherein m and n are both positive integers, and m ≥ n, h=m-n, h ≥2; wherein the n first monofilament layers, from inside to outside in the radial direction of the submarine cable, are welded to the n second welding monofilament layers in a one-to-one relationship; wherein the h second winding monofilament layers are, sequentially from inside to outside in the radial direction of the submarine cable, wound outside an outermost layer of the n first monofilament layers; and for any two adjacent second winding monofilament layers, a winding part of a second winding monofilament layer located outside covers a winding part of a second winding monofilament layer located inside; wherein the winding part refers to a portion of each of the second winding monofilament layers wound outside the outermost layer of the first monofilament layers; and wherein an area in which the n first monofilament layers are connected to the m second monofilament layers forms a conductor welding area of a joint; wherein a difference between a winding pitch of the winding part of each of the second winding monofilament layers and a stranding pitch of a stranding part of each of the second winding monofilament layers is less than a preset difference; and wherein the stranding part refers to a portion of each of the second winding monofilament layers stranded outside an outermost layer of the second welding monofilament layers, and the preset difference is 10% of the stranding pitch of the stranding part of each of the second winding monofilament layers. a submarine cable section which comprises a first conductor, wherein the first conductor comprises n first monofilament layers sequentially arranged from inside to outside in a radial direction of the submarine cable; and a landing cable section which comprises a second conductor, wherein the second conductor comprises m second monofilament layers sequentially arranged from inside to outside in the radial direction of the submarine cable, and the m second monofilament layers are sequentially divided from inside to outside in the radial direction of the submarine cable into n second welding monofilament layers and h second winding monofilament layers, wherein m and n are both positive integers, and m ≥ n, h=m-n, h ≥2; wherein the n first monofilament layers, from inside to outside in the radial direction of the submarine cable, are welded to the n second welding monofilament layers in a one-to-one relationship; wherein the h second winding monofilament layers are, sequentially from inside to outside in the radial direction of the submarine cable, wound outside an outermost layer of the n first monofilament layers; and for any two adjacent second winding monofilament layers, a winding part of a second winding monofilament layer located outside covers a winding part of a second winding monofilament layer located inside; wherein the winding part refers to a portion of each of the second winding monofilament layers wound outside the outermost layer of the first monofilament layers; and wherein an area in which the n first monofilament layers are connected to the m second monofilament layers forms a conductor welding area of a joint; wherein a difference between a winding pitch of the winding part of each of the second winding monofilament layers and a stranding pitch of a stranding part of each of the second winding monofilament layers is less than a preset difference; and wherein the stranding part refers to a portion of each of the second winding monofilament layers stranded outside an outermost layer of the second welding monofilament layers, and the preset difference is 10% of the stranding pitch of the stranding part of each of the second winding monofilament layers.