Protective device applied to railway overhead line system

The utility model discloses a protective device applied to a railway catenary, which comprises two positioning plates, four positioning pins are inserted into the upper surfaces of the two positioning plates, the upper surfaces of the two positioning plates are fixedly connected with supporting frames, the upper surfaces of the two supporting frames are fixedly connected with positioning frames, and the positioning frames are fixedly connected with the upper surfaces of the two positioning plates. Arc-shaped frames are fixedly connected to the opposite faces of the two positioning frames, and inclined plates are fixedly connected to the inner walls of the two positioning frames. According to the protection device applied to the railway contact network, falling stones directly fall on a rubber buffer pad, an arc-shaped plate and two movable plates are driven to move downwards through falling force, the two movable plates can extrude springs on the surface of a limiting lead screw, and meanwhile, the two movabl