Signal indicating device for preventing train rear end collision

The signal indicating device for preventing train rear end collision comprises a display device (1), a wireless transceiver (2), a detector (3), a power supply unit (4) and a controller (5); the power supply unit (4) is connected with the power ports of the display device (1), the wireless transceiver (2), the detector (3) and the controller (5); the display device (1), the detector (3) and the wireless transceiver (2) are electrically connected with the controller, respectively, so that the train rear end collision is prevented via alarming the following train by the display device.