The invention relates to a leakage cable clamp. The leakage cable clamp comprises a corbel type G-shaped seat which is integrally structured by a bottom plate and an inclined block, and a concave part used for accumulating a leakage cable is arranged in the corbel type G-shaped seat; a cover body and the corbel type G-shaped seat can be fixedly connected through respective wedge-shaped fixture block mechanisms; a pressing leakage cable plate sheet is formed on the cover body; under the mounting state of the leakage cable clamp, the pressing leakage cable plate sheet and the bottom of the corbel type G-shaped seat are arranged oppositely, the pressing leakage cable plate sheet, at the same time of being locked through respective wedge-shaped fixture block mechanisms, abuts to and tightly presses the leakage cable in the corbel type G-shaped seat. With the adoption of the technical scheme, the orientation problem when the leakage cable is installed in a railway tunnel is ensured by the product structure to the utmost extent; in terms of the required orientation angle, if the leakage cable is arranged around 2.5 m, the horizontal direction can be formed as long as the convex conduit at the bottom of the leakage cable aligns to the sunken conduit at the lower side of the system; and corresponding radiation angles can be adjusted according to different positions of positioning grooves in terms of the other mounting heights, and thus, the orientation problem is solved.