The invention is suitable for the technical field of image noise reduction, and provides a noise reduction and sharpening combined processing method and device, and the method comprises the steps: importing image information, processing the image information, carrying out the noise reduction and sharpening of an image in a mode that the size of a processing window is dynamically variable, and completing the needed processing through the multiplication and addition operation as much as possible; data processing: extracting the same or similar operations of sharpening and noise reduction in the step 2, uniformly processing the operations, and carrying out resource sharing and dynamic allocation; noise reduction processing: performing noise reduction processing according to the edge information calculated in the above step, and outputting processed data or performing sharpening processing on the processed data; and S5, carrying out sharpening treatment. By unifying the processing methods of image noise reduction and image sharpening, the same or similar operators are used for processing, and the processing resources can be dynamically allocated on the implementation device, so that the image noise reduction or sharpening processing capability of a special scene can be greatly enhanced under the condition of reducing the cost.