The intelligent perimeter security alarm system is composed of intelligent perimeter surveillance terminals, security radar sensors, video surveillance cameras, integrated intelligent AI algorithm, and perimeter security alarm management platform software. When the intruder enters the alarm zone area, the radar sensor delivers the intrusion location through active detection, accurately determines the type of intrusion with AI vision, records video of the intrusion process, and reports to the perimeter security alarm management platform, so active, three-dimensional monitoring and early warning of the perimeter is addressed.