Fall detector is with 60GHz millimeter wave radar, based on Doppler radar technology, to realize personnel status in the radar scanning area, better protection of user privacy. It can identify manned/unmanned and human activity status through radar scanning. It also can sense the posture and movement of the human body, so as to realize the fall monitoring. The product is not affected by temperature, humidity, noise, airflow, dust, light, etc., suitable for harsh environment.