Target object positioning virtual-real fusion method and device

The invention provides a target object positioning virtual-real fusion method and device. The method comprises the following steps: acquiring coordinates of a target object in a world coordinate system and a position and a viewing angle direction of each camera in the world coordinate system; a world matrix and an inverse matrix thereof are introduced; acquiring coordinates of the target object ina camera coordinate system of each camera through coordinate conversion; judging whether the coordinate in the camera coordinate system is within the three-dimensional vision field range of the BIM three-dimensional model of each camera or not; obtaining a display monitoring state of the target object by calling a monitoring video of a camera in the vision field range; according to the invention,bidirectional mapping of the target object between the physical entity (the target object) corresponding to the monitoring video and the digital space corresponding to the BIM three-dimensional modelis realized, and retrieval