The invention relates to a safety warning device for area protection, comprising a singlechip module 1; the singlechip module 1 is connected with a ZIGBEE wireless module 2 and is respectively connected with a relay 4, a relay 6 and a relay 8, the singlechip module 1 is connected with an audible and visual alarming module 9 and is communicated with a ZIGBEE wireless module 12 in a wireless way, the ZIGBEE wireless module 12 is connected with a monitoring main machine 10, an infrared shooting module leads the relay 6, the relay 8 and the relay 4 to close sequentially by circulating scanning, if an invader exists, the alarming module 9 alarms and transmits the message to the monitoring main machine 10; the invader 17 leaves the protection area, the closing sequence is relay 4, the relay 8 and the relay 6, which represents that the invader leaves, and the message is transmitted to the monitoring main machine 10; the device has the characteristics of high measuring accuracy and high anti-jamming capacity.