Guide rail detection device

The utility model belongs to the technical field of guide rail maintenance, and discloses a guide rail detection device, which comprises a top plate, a hollow cavity is arranged on the inner side of the top plate, a groove is arranged above the hollow cavity, a first threaded column is arranged on one side of the top plate and fixedly connected with the top plate, a flaw detector is arranged at the bottom end of the top plate, and a second threaded column is arranged at the other side of the top plate. A camera is arranged on one side of the flaw detector, a first vertical cylinder is mounted on the first threaded column, and a hollow cylinder is arranged at the bottom end of the first vertical cylinder; the flaw detector and the code spraying device are arranged to facilitate use, and the arranged flaw detector can move above the rail after being installed, so that flaw detection is continuously carried out on the guide rail in the moving direction on the guide rail, and compared with a manual checking mode,