Abstract: A device for providing 3D image registration includes: a collection unit acquiring 3D depth data of a part and an image of a registration body from a depth recognition camera and acquiring three-dimensional coordinates of a positioning tool on the registration body from a positioning device; a first registration unit performing surface registration of a pre-stored 3D medical image of patient and the 3D depth data; a second registration unit extracting camera reference three-dimensional coordinates of a landmark attached to the registration body from the image of the registration body and converting pre-stored relative position information of the landmark with reference to the three-dimensional coordinates of the positioning tool, to perform registration of camera reference three-dimensional coordinates of the landmark and the converted position information thereof; and a third registration unit performing final registration by using results of registration performed by the first registration unit and the seco