Air danger approaching automatic alarm and alarm control method thereof

The invention discloses an automatic alarm for air danger approaching, and mainly solves the problems of intermittent alarm and alarm interference of two machines in the prior art. The alarm comprisesan airport signal transmitter used for transmitting signals to airplanes in an airport, and an alarm control circuit used for transmitting signals to other airplanes and receiving signals of other airplanes and the airport. The alarm control circuit comprises an airplane signal transmitter, a state indication circuit, a voltage stabilizing circuit, a pulse oscillation circuit, a sound-light alarmcircuit, a signal receiving control circuit and an airplane signal receiver. According to the invention, the airport signal transmitter and the signal receiving control circuit are arranged in the airport; all the alarm circuits are closed by transmitting special airport signals, when the airplanes fly away from the airport by a certain distance and do not receive the signals transmitted by the airport annunciator any mor