The invention discloses a leaky cable and a method for manufacturing the leaky cable, which are used for solving the problems that in the prior art, the leaky cable is difficult to fix and mount and is inconvenient to lay. The method comprises the following steps of: determining the first thickness of a copper inner conductor in an inner core layer in the leaky cable; selecting a metal or a metal alloy of which the density is smaller than that of the copper inner conductor, and determining the second thickness of the metal or the metal alloy; manufacturing the inner core layer according to the first thickness and the second thickness, and coating an inner conductor of the metal or the metal alloy by the copper inner conductor; and manufacturing an insulating layer and an outer core layer of the leaky cable in turn on the outer layer of the copper inner conductor in the inner core layer, opening slotted holes on the outer core layer, and manufacturing a jacket on the outer layer of the outer core layer. The scheme provided by the invention can effectively lighten the weight of the leaky cable, reduce the difficulties of fixing and mounting the leaky cable and facilitate the laying of the cable on the premise of not changing the transmission signal quality of the leaky cable.