The invention relates to an intelligent portable safety fence which comprises a plurality of stand columns connected through extensible belts. The extensible belts are wound in the stand columns, extend out when being pulled and automatically rewinds into the stand columns when not pulled. The intelligent portable safety fence is characterized in that the stand columns are provided with pyroelectric sensors and alarms, the pyroelectric sensors are provided with switches and electrically connected with the alarms, and the pyroelectric sensors are used for receiving and magnifying infrared radiation generated by movement of people and driving the alarms to send alarming signals. The intelligent portable safety fence is simple in structure, has the functions of automatically detecting mistaken intrusion of people, alarming in advance, striking warning marks and the like, can protect absolute security of people and equipment in high-voltage testing sites and can improve safety of the high-voltage testing sites.