A rearview panoramic head-up display device for vehicles, which includes a camera lens input port group, a base, a display module, a detection module and a semitransparent reflective film. The camera lens set on each side outside the car are used to capture the image around the car and transmit the images to the present device inside the car. A three-dimensional rear panoramic image is formed by synthesizing the images by a panoramic display processor in the present device and projected on the windshield of the car by the display module, so that the driver may observe the real-time condition in rear, left rear and right rear of the car while looking ahead, the driver may know the condition around the car without moving the line of sight through a large angle, to thereby improve traffic safety.