The invention relates to an X ray standard detection system. The X ray standard detection system comprises an X ray generation device for generating a horizontal emergent X ray beam, a baffle with a diaphragm, a shutter comprising a baffle with a through hole and a movable anti-dazzling screen, a filter device comprising two groups of filtering turntables symmetrically arranged by taking the through hole as the center position, and a guide rail platform comprising a guide rail arranged parallel with the emergent direction of the X ray beam and a measuring verification platform moving on the guide rail in parallel, wherein the center of the through hole, the center of the diaphragm and the center of the X ray beam are at the same straight line; each group of filtering turntable comprises N light filtering holes, and light filters are clamped in the light filtering holes; when the filtering turntables rotate, two of the light filtering holes along the rotation direction are aligned with the position of the through hole, so the X ray beam is filtered by the light filters in the light filtering holes and then is emergent from the through hole; the measuring verification platform is adjusted to coincide the center of an object to be detected on the measuring verification platform and the center of the X ray beam.