The invention relates to an improved oil-filled cable. The improved oil-filled cable comprises an oil passage, a conductive wire tube, a shielding layer, an insulating layer and a protective sleeve which are arranged from inside to outside. The oil passage is internally filled with insulating oil. The conductive wire tube is formed by metal wires through tight screwing. The two end parts of the oil-filled cable are also provided with oil storage tanks communicated with the oil passage. The oil passage is made from hard oil immersed membranes. Throttle valves are equidistantly installed on the axis of the oil passage. Each throttle valve comprises two throttle sheets perpendicular to the axis of the oil passage. Each throttle sheet is provided with a throttle hole. A throttle plug is flexibly installed between the two throttle sheets. According to the cable, assembling height difference of the oil-filled cable can be expanded, application space of the oil-filled cable can be increased and generation of air gaps in the cable can be effectively prevented.