The embodiment of the invention discloses a judgment method for detecting power switch X ray image quality. The method comprises the steps of setting a first image quality indicator and a second image quality indicator at the two sides of a power switch shell respectively; conducting X ray irradiation on a power switch for multiple times; obtaining image information on an imaging plate of each image quality indicator in each irradiation; judging the X ray image quality according to the image information on the imaging plates. The first image quality indicator and the second image quality indicator are arranged at the two sides of the power switch so that equipment inside the power switch can conduct complete image formation. After multiple times of X ray irradiation, the image information on the imaging plates of the two image quality indicators is obtained, multiple sets of images are compared, an X ray image, with the minimum twin-wire space, in each image quality indicator is screened out, and the minimum twin-wire space is compared with a preset distance to judge the image quality of the X ray.