The present invention relates to a method for simulating image quality improvement of an image display device, in which the image display device to be tested is made to display an optimized picture quality with a simplified process by applying simplified simulation program and device; and a device therefor. The method for simulating picture quality improvement of an image display device includes the steps of selecting at least one input image data from a list of plurality of test image data by using a file input/output interface unit of a simulation tool, selecting at least one image processing algorithm from a list of a plurality of image processing algorithms by using an image control interface unit, applying the at least one image processing algorithm selected thus to the at least one input image data to convert the at least one input image data by using an algorithm application control unit, comparing and determining at least one output image data converted and forwarded thus to the input image data, and analyzing characteristics of the output image data by using a resultant image analysis and control unit.