The invention discloses a combined X-ray converging optical element used for converging high-energy X-ray and filtering low-energy X-ray. The optical element has an axis symmetric structure, and an outline bus in the axial direction is a combination of two quadratic curve segments; the optical element comprises a plurality of solid components by which X-ray is converged and diverged; the solid components are made of glass material and plated with metal films on the lateral walls; critical surfaces of the glass material and the metal films form reflecting surfaces for reflecting X-ray when theX-ray passes by the reflecting surfaces; one end of each solid component is used for receiving the X-ray and the other end is used for outputting the X-ray.