Disclosed are an image processing method and device used for an electronic device comprising a lens unit and a virtual reality display device. The image processing method comprises: determining the size of an image to be cached according to the size of an input image and anti-distortion parameters of a lens unit (S501); and generating an anti-distortion cache image having said image size on the basis of the input image and the anti-distortion parameters according to the size of the image to be cached (S502), wherein generating an anti-distortion cache image having said image size comprises: selecting a row of pixels from the input image and performing an anti-distortion operation on the row of pixels, the anti-distortion operation comprising determining pixel data corresponding to the anti-distortion image of the row of pixels according to the anti-distortion parameters, and writing pixel data of the anti-distortion image into the anti-distortion cache image.