The invention discloses a natural disaster automatic early warning system and a realization method thereof. Defects that according to the conventional natural disaster early warning system, the early warning is not in time, and the human disturbance factor is large are overcome. The natural disaster automatic early warning system comprises a satellite positioning early warning system, a sensor direct early warning system, a safety evaluation system used for receiving feedback signal data from the satellite positioning early warning system and the sensor direct early warning system and performing safety assessment, and an early warning device used for performing early warning according to an assessment result of the safety evaluation system, the satellite positioning early warning system comprises a displacement and positioning device and a satellite positioning device used for monitoring the displacement and positioning device in real time, and the sensor direct early warning system comprises a sensor set and an acquisition center used for receiving and collecting data acquired by the sensor set. According to the natural disaster automatic early warning system, the satellite positioning early warning system and the conventional sensor early warning system are combined, the rapidness of satellite monitoring is provided, and the monitoring accuracy of the conventional sensors is provided.