Vehicle-mounted communication transponder

The utility model relates to the technical field of railway traffic safety, and discloses a vehicle-mounted communication transponder which comprises two fixing plates, the fixing plates are Z-shaped, the structures of the two fixing plates are the same, the two fixing plates are arranged in a mirror image mode, the two fixing plates are provided with supporting plates, the supporting plates are in an n shape, and the supporting plates are connected with the fixing plates. The vehicle-mounted communication transponder comprises a supporting plate, two sliding grooves extending out of the lower surface of the supporting plate are formed in the upper surface of an upper side transverse plate of the supporting plate, connecting blocks are slidably connected into the sliding grooves, the lower surfaces of the two connecting blocks extend out of the lower surface of the upper side transverse plate of the supporting plate through the sliding grooves, and positioning plates are fixedly connected to the lower surface