The invention relates to the field of image processing, in particular, to an image processing method and device. The method comprises: obtaining image data and splicing to obtain a spliced image data block; matching an image data block containing the image data in the spliced image data block with images of blocks in a three-dimensional image frame database, updating a three-dimensional image model of a user and displaying according to a first preset displaying strategy if at least one mapping relation is obtained; displaying according to a second preset displaying strategy if the spliced image data block do not have mapping relation; if the preset conditions are met, the user's three-dimensional image model, the recorded number information of the blocks which have determined to obtain the mapping relationship and/or the image data blocks which have not obtained the mapping relationship are uploaded to the cloud server, so that the cloud server updates the three-dimensional image Frame database, and the three-dimensional image can be obtained without continuously and orderly scanning the oral cavity, and the three-dimensional image frame database is continuously improved to improve the matching success rate.