The utility model discloses a distribution line height warning device. The distribution line height warning device comprises a hook component and a warning device body, wherein the hook component is hung on a cable. A supporting block is arranged at the bottom of a main body connecting part of the hook component, a screw rod is arranged on the supporting block, the top end of the screw rod is movably connected with a clamping block, a circular ring is arranged at the bottom end of the screw rod, and the axis of the circular ring is perpendicular to the axis of the screw rod. The warning device body comprises a solar warning light. The top end of the solar warning light is fixedly connected with a connecting component which is hinged to the bottom of the main body connecting part of the hook component. The distribution line height warning device can prevent a distribution line from being hung up by excessively high vehicles coming and going when the light ray is bad, wherein the vertical distance between the distribution line and the ground is not large enough.