PROBLEM TO BE SOLVED: To effectively eliminate motion artifacts caused by motions of a scanned object itself during CT scanning in a CT device and method based on motion compensation.SOLUTION: The present invention obtains motion parameters of an imaging target object by using a stereoscopic motion measurement system, and then implements motion compensation by a technique based on reconstructed image matrix transformation, thereby obtaining a clear two-dimensional/three-dimensional CT image while eliminating motion artifacts. The present invention can effectively eliminate motion artifacts caused by motions of the scanned object itself during CT scanning, and can easily be embedded into conventional CT scanning devices while implementing seamless connections. The present invention can effectively improve the quality of conventional CT images, and is especially important not only for CT imaging of some special groups of objects that cannot control their own motions, such as Parkinson's patients, infants, living mice and so on, but also for ultrahigh-resolution imaging of human bodies.