With the rapid development of social economy and science and technology, the metal detector, a device that can perform people screening, has undergone several generations of detection technology changes, from the initial signal simulation technology to continuous wave technology, to the digital pulse technology used today, metal. The detector introduces a variety of scientific and technological achievements based on the principle of simple magnetic field cutting. The application field has also been extended to multiple industries with the improvement of product quality. So, do you really understand the metal detectors that can be used for people screening? Can it only be used for people screening? The following article gives a brief introduction to the metal detectors that can be used for people screening.