The utility model discloses a highway cross -line construction infrared ray early warning video monitor system, it contains the door opening of traveling and shunts the door opening, travel and be provided with limit for height limit for width portal on the highway in door opening and reposition of redundant personnel door opening the place ahead infrared ray warning pole setting, infrared limit for width inductor and infrared limit for height inductor has set gradually on the reposition of redundant personnel lane between limit for height limit for width portal and the reposition of redundant personnel door opening, infrared ray warning pole setting is located the both sides of shunting the lane respectively with infrared limit for width inductor and infrared limit for height inductor, be provided with between infrared ray warning pole setting and the infrared limit for width inductor and meet stifled reposition of redundant personnel lane department, reposition of redundant personnel door opening department is provided with the high pitch alarm, the signal that sets up in the infrared ray warning pole setting connects a ware will monitor signal transmission to surveillance center. The utility model discloses accomplish early warning in advance, ensured deck bridge liangmen hole and support safety, ensured construction safety to improve by a wide margin and protect the efficiency of leading to work, the effectual intensity of protecting the operation of versatile person person that has alleviateed.