Portable intelligent alarm fence and human proximity detection method

The invention discloses a portable intelligent alarm fence, and belongs to the technical field of a safety protection appliance. The portable intelligent alarm fence comprises a plurality of vertical rods, an entrance guard module and a host computer. Two adjacent vertical rods are connected through arrangement of a telescoping band, the telescoping bands are arranged inside the vertical rods, processors are arranged at lower positions inside the vertical rods, the processors are respectively electrically connected with cameras, acousto-optic alarm modules and distance measuring sensors, the processors communicate with the host computer through a wireless network, and the vertical rods are also internally provided with rechargeable batteries. According to the invention, the ultrasonic distance measuring sensors carry out detection by use of a supersonic wave echo ranging principle according to a Doppler effect of a mobile object, human identification is finished by use of an image processing means, and the problems of sensitivity to ambient temperature in human identification and insensitivity to object barriers in the human detection when infrared sensors are used for detecting specific-wavelength infrared rays emitted by a human body are solved.