An image integrated warning system for a vehicle, includes the component of a camera unit, a sensing unit, an image stitching module, an image identification module, an image integration module and a display unit etc. A predefined virtual alert range is integrated into a vehicle surrounding real image, and an approaching obstacle is indicated in a warning section according to an identification message of an image identification and a sensing message of a sensing unit, thereby allowing the driver to understand the location and distance of the obstacle relative to the vehicle from the image directly. Consequently, the effects of safe warning, facilitated determination and observation for the driver can be achieved.