Three-dimensional projection display system

A three-dimensional projection display system for displaying a three-dimensional image includes a refraction lens module, a projection module, an intensification lens, and an intensification display module. The refraction lens module is arranged in an annular shape and defines an inner area and an outer area. The projection module is disposed in the outer area and has a plurality of image light sources. Each image light source projects a segmented image at a different angle, and the segmented image is refracted through the refraction lens module, thereby focusing the images in the inner area to form a three-dimensional image. The intensification lens is disposed in the inner area and provides an intensified image, which is projected to be combined with the three-dimensional image through the intensification lens. Thus, the present invention achieves greater entertainment effect and creates a sense of reality of the three-dimensional image.