A method for manufacturing a cable-type secondary battery comprising an inner electrode extending longitudinally and including a current collector having a horizontal cross section of a predetermined shape and an active material layer formed on the current collector, an electrolyte layer, and a protection coating, the method comprising: forming an anode having a first electrolyte layer thereon by sequentially extrusion-coating an electrode slurry and a solid electrolyte material put through a providing unit of an extruder comprising an O-die on a current collector that goes through the O-die, the anode having a horizontal cross section of a predetermined shape and extending longitudinally; forming a cathode by extrusion-coating an electrode slurry put through the providing unit of the extruder comprising the O-die on a current collector that goes through the O-die; the forming of the anode and the cathode including putting the electrode slurry including the active material, a polymer binder, and a solvent into the extruder; extrusion-coating the electrode slurry on the current collector while continuously providing the current collector to the extruder; and drying the current collector coated with the electrode slurry to form the active material layer; forming a second electrolyte layer around the perimeter of an inner electrode by extrusion-coating a solid electrolyte material put through a providing unit of the extruder comprising the O-die, the inner electrode including the anode and the cathode arranged in parallel; and forming a protection coating around the second electrolyte layer, wherein the solid electrolyte material includes an electrolyte selected from the group consisting of a gel polymer electrolyte of polyethylene oxide, polyvinylidene fluoride (PVdF), polymethylmethacrylate (PMMA), polyacrylonitrile, or polyvinylpyrrolidone, polyvinylacetate (PVAc); and a solid polymer electrolyte of polyethylene oxide, polyphenylene oxide, polyetherimide, polyethersulfone, or polyvinylacetate (PVAc). forming an anode having a first electrolyte layer thereon by sequentially extrusion-coating an electrode slurry and a solid electrolyte material put through a providing unit of an extruder comprising an O-die on a current collector that goes through the O-die, the anode having a horizontal cross section of a predetermined shape and extending longitudinally; forming a cathode by extrusion-coating an electrode slurry put through the providing unit of the extruder comprising the O-die on a current collector that goes through the O-die; the forming of the anode and the cathode including putting the electrode slurry including the active material, a polymer binder, and a solvent into the extruder; extrusion-coating the electrode slurry on the current collector while continuously providing the current collector to the extruder; and drying the current collector coated with the electrode slurry to form the active material layer; forming a second electrolyte layer around the perimeter of an inner electrode by extrusion-coating a solid electrolyte material put through a providing unit of the extruder comprising the O-die, the inner electrode including the anode and the cathode arranged in parallel; and forming a protection coating around the second electrolyte layer, wherein the solid electrolyte material includes an electrolyte selected from the group consisting of a gel polymer electrolyte of polyethylene oxide, polyvinylidene fluoride (PVdF), polymethylmethacrylate (PMMA), polyacrylonitrile, or polyvinylpyrrolidone, polyvinylacetate (PVAc); and a solid polymer electrolyte of polyethylene oxide, polyphenylene oxide, polyetherimide, polyethersulfone, or polyvinylacetate (PVAc).