A dynamic and static submarine cable, comprising: a cable core comprising: a dynamic section, a static section, and a transition section connecting the dynamic section and the static section, wherein the dynamic section, the static section, and the transition section are of an integral structure; a first armor layer sleeved outside the dynamic section, the static section and the transition section; and a second armor layer sleeved outside the first armor layer corresponding to the dynamic section, characterized by further comprising: a transition device sleeved outside the first armor layer corresponding to the transition section; and the second armor layer having a first end covering part of the transition device and welded to an outer peripheral surface of the transition device; wherein the transition device comprises a heat transfer unit and a welding unit, and the heat transfer unit covers an outside of the first armor layer corresponding to the transition section; the welding unit is of an annular structure and is sleeved outside the heat transfer unit; and the first end of the second armor layer is welded to an outer peripheral surface of the welding unit; wherein the welding unit comprises two half-ring parts, and each of the half-ring parts comprises, along an axial direction thereof, a welding fixing area, and two smooth transition areas respectively connected to two ends of the welding fixing area; and wherein a thickness of the welding fixing area is greater than thicknesses of the smooth transition areas, and the first end of the second armor layer is welded to an outer peripheral surface of the welding fixing area. a dynamic section, a static section, and a transition section connecting the dynamic section and the static section, wherein the dynamic section, the static section, and the transition section are of an integral structure; a first armor layer sleeved outside the dynamic section, the static section and the transition section; and a second armor layer sleeved outside the first armor layer corresponding to the dynamic section, characterized by further comprising: a transition device sleeved outside the first armor layer corresponding to the transition section; and the second armor layer having a first end covering part of the transition device and welded to an outer peripheral surface of the transition device; wherein the transition device comprises a heat transfer unit and a welding unit, and the heat transfer unit covers an outside of the first armor layer corresponding to the transition section; the welding unit is of an annular structure and is sleeved outside the heat transfer unit; and the first end of the second armor layer is welded to an outer peripheral surface of the welding unit; wherein the welding unit comprises two half-ring parts, and each of the half-ring parts comprises, along an axial direction thereof, a welding fixing area, and two smooth transition areas respectively connected to two ends of the welding fixing area; and wherein a thickness of the welding fixing area is greater than thicknesses of the smooth transition areas, and the first end of the second armor layer is welded to an outer peripheral surface of the welding fixing area. a transition device sleeved outside the first armor layer corresponding to the transition section; and the second armor layer having a first end covering part of the transition device and welded to an outer peripheral surface of the transition device; wherein the transition device comprises a heat transfer unit and a welding unit, and the heat transfer unit covers an outside of the first armor layer corresponding to the transition section; the welding unit is of an annular structure and is sleeved outside the heat transfer unit; and the first end of the second armor layer is welded to an outer peripheral surface of the welding unit; wherein the welding unit comprises two half-ring parts, and each of the half-ring parts comprises, along an axial direction thereof, a welding fixing area, and two smooth transition areas respectively connected to two ends of the welding fixing area; and wherein a thickness of the welding fixing area is greater than thicknesses of the smooth transition areas, and the first end of the second armor layer is welded to an outer peripheral surface of the welding fixing area.