The invention discloses an X-ray bundle filtering device, a bundle limiting device and medical diagnosis X-ray equipment. The X-ray bundle filtering device comprises a power source, a first filter sheet assembly with a first filter sheet, a second filter sheet assembly with a second filter sheet, and a separation-reunion device, wherein the power source drives the first filter sheet assembly to linearly reciprocate in the first direction; the height difference is formed between the second filter sheet and the first filter sheet; and in the motion stroke of the first filter sheet assembly and the second filter sheet assembly, the first filter sheet and the second filter sheet are respectively provided with action positions within an X-ray bundle range and non-acted positions positioned beyond the X-ray bundle range. Due to the setting of the separation-reunion device, the first filter sheet assembly and the second filter sheet assembly can simultaneously move or relatively move, and thus the first filter sheet assembly and the second filter sheet assembly can be controlled by a group of power sources, various filter grades are realized, the occupied space is saved, the cost is reduced, the structural design of the bundle limiting device is facilitated and the size of the bundle limiting device is effectively controlled.