Automatic flag-waving warning device and method

The invention discloses an automatic flag-waving warning device and method. The automatic flag-waving warning device comprises a case, a flagpole and a warning device which are mounted outside the case, and a driving structure in the case; the flagpole can be driven by the driving structure to swing back and forth relative to the case, and a flag is fixed on the flagpole; the warning device comprises a sound warning device and/or a vision warning device, and according to the warning method, the flag waving amplitude and the alarming frequency of the warning device are changed by detecting thedistance between the human body or an object and the warning device, so that the warning purpose is achieved. The automatic flag-waving warning device sufficiently uses multiple means such as sound, light and flag waving, achieves the warning and striking requirements, is convenient to use, easy to operate and convenient to maintain, can adapt to severe environments such as rain, snow and dustiness, and can improve the se