Replacing device for railway construction parking device

The utility model relates to the technical field of railways, and particularly discloses a railway construction parking device replacing device which comprises a first fixing frame, a second fixing frame is movably installed on the right side of the first fixing frame, a reflecting plate is fixedly installed on the inner side wall of the second fixing frame, and ground nails are installed at the bottoms of the first fixing frame and the second fixing frame in an embedded mode. Perforated plates are fixedly mounted at the tops of the first fixing frame and the second fixing frame. The first fixing frame and the second fixing frame are installed on the two sides of a rail, the device is located at the long distance from the two ends of a railway construction point, and the forbidding sign plate can warn a train not to travel forwards; when the train runs, the photoelectric sensor can be triggered, the speed measuring instrument can measure the speed of the train, a signal is transmitted to the wireless signal r