The invention belongs to the technical field of components for space navigation and particularly relates to design of an X-ray detection testing clamp. The clamp adopts the sleeved design manner, canextend out and draw back, has high expansibility and is suitable for various packaging modes. A sub clamp body and a master clamp body are fixed with a snap spring and can be disassembled conveniently. According to the clamp, a matrix array is adopted, the components can be accurately positioned and quickly found and metered; the clamp is easy and convenient to operate, can quickly overturn the to-be-tested component, meets the multi-direction ray detection testing requirement of the components and greatly improves the X-ray testing efficiency. By means of the clamp, the problem of dominant damage and invisible damage to the components by fixation of a conventional gluing method can be avoided.