a method and device for generating a perspective image are provided , which are related to multimedia technology . the method comprises the following steps : acquiring the length , height and vanishing point of a required perspective image and the length and height of an original image ; for each pixel point in the perspective image , determining the coordinate of a pixel point in the original image corresponding to said pixel point ; copying the pixel point at the coordinate in the original image to the position corresponding to the coordinate in said perspective image . the invention utilizes a principle that perspective image is smaller than original image , and employs a form of inverse transform , thereby the calculated pixel points are reduced , and compared with forward calculation , the calculation is greatly reduced , which improves the speed of perspective image generating and saves central processing unit resources .