Disclosed is a cable-type secondary battery, including: a winding core; an inner electrode support wound on the outside of the winding core in the form of a spaced spring so that the winding core may be exposed partially; a sheet-type first inner electrode formed on the outside of the exposed winding core by spiral winding; a sheet-type first separation layer formed on the outside of the first inner electrode by spiral winding; a sheet-type second inner electrode formed on the outside of the first separation layer by spiral winding; a second separation layer formed on the outside of the second inner electrode by spiral winding; and an outer electrode formed on the outside of the second separation layer by spiral winding.