The invention discloses a digital X-ray image contrast enhancement processing method, and belongs to the technical field of medical instruments. The digital X-ray image contrast enhancement processing method is characterized by comprising the following steps: according to X-ray imaging characteristics, dynamically expanding an interesting human body area image, and dynamically compressing non-human body image information, thereby effectively increasing the contrast of interesting area images; implementing detail enhancement and multi-scale contrast resolution enhancement on images adjusted within a dynamic range, and adjusting the naked eye watching effect of acquired images, thereby completely displaying human body information to a diagnosis doctor. The digital X-ray image contrast enhancement processing method has the advantages that human body image details are conspicuously highlighted, all information of the images can be watched in the same window, lung marking, lung marking tail end renal vessels, bone marking, muscle levels, brain vessels and the like can be all clearly displayed, and the diagnosis skill level can be greatly improved. In addition, on the basis of airspace image processing, the method is high in processing speed and can be applied to a dynamic image processing system.