1. A virtual reality display method, the method comprising: acquiring, by a picture acquisition unit of a virtual reality display system, a real scene picture; retrieving, by an image retrieval unit of the virtual reality display system, from the real scene picture a target image having a same shape and color as a sample image; extracting, by the image retrieval unit, space coordinates of the target image; and displaying, by an image processing unit of the virtual reality display system, the real scene picture with the target image shielded off or highlighted according to the space coordinates, wherein retrieving from the real scene picture a target image having the same shape and color as a sample image comprises: performing, by the image retrieval unit, gray scale processing on the real scene picture to display the picture in gray; retrieving and identifying, by the image retrieval unit, contours of different images in the real scene picture to identify quasi-target images having the same shape as the sample image; and identifying, by the image retrieval unit, colors of the quasi-target images to identify a target image having the same color as the sample image.