The present invention provides a support device for an X-ray detector and an X-ray detection device, the support device comprising a bottom plate and a limiting device mounted on the bottom plate, the limiting device comprising a limiting frame, two mounting members connected to the limiting frame, and two stoppers respectively arranged on the two mounting members. At least one of the two mounting members is configured to be able to move in a particular direction and to be limited at one of a plurality of fixed positions on the limiting frame, and the two stoppers are used for limiting the movement of the X-ray detector in the particular direction.
