To provide a radio alarming system for the approach of a train, which can send a train approach alarm on the real time basis to a watcher and is suitable for moving works.

The alarm system concerned includes control stations 7, 8 installed at the boundaries between preset divisions 4, 5, 6 on the train tracks 1, 2, transmitting stations 9-12 which are connected with the control stations 7, 8 through a trackside telephone circuit 13, transmit and receive the transmitting station information to/from the control stations 7, 8, and emit an alarm signal wirelessly when a train approach information is included in the received transmitting station information, rail circuits 14-21 which is connected with the transmitting stations 9-12 and senses the approach of any train, and radio receivers 22, 23 which emit an alarm on the basis of the alarm signal given from the transmitting stations 9-12.