X-ray protection device for CT system and CT system

The utility model discloses an X-ray protection device for a CT system and the CT system.The X-ray protection device comprises an X-ray protection assembly which is installed on a CT scanning rack or independently arranged on one side of the CT scanning rack, the X-ray protection assembly is of an iris type structure and used for shielding a scanning hole of the CT scanning rack, and the X-ray protection assembly is provided with an adjusting hole for a scanning bed to pass through; the aperture of the adjusting hole is adjustable, and the adjusting hole and the scanning hole are coaxially arranged; the detection assembly is used for detecting the size and the position of a to-be-detected target on the scanning bed; the control assembly is in signal connection with the detection assembly and the X-ray protection assembly, and the control assembly continuously controls the adjusting hole to expand or contract according to the detection result of the detection assembly. The automatic protection function can be