The invention relates to a coal mining machine remote-sensing prewarning device which comprises a power source control box, a remote-sensing signal transmitter, a remote-sensing signal receiver and LED antiexplosion lamps. The remote-sensing signal transmitter, the remote-sensing signal receiver and the LED antiexplosion lamps are connected with the power source control box, the remote-sensing signal transmitter is mounted on a coal mining machine, and one LED antiexplosion lamp is mounted in a roadway of each of upper and lower ports and connected with the remote-sensing signal transmitter. The device has the advantages that after completing work, the coal mining machine leaves a preset range, and a warning red lamp is off at the same time to indicate that roadway pedestrians can pass. Roadway port blockage prewarning automation is realized, processes are simplified, input of operating personnel is reduced, and working efficiency is improved.