An acetabular cup detaching apparatus for an artificial hip joint, according to an embodiment of the present invention, comprises: a body part that rotates with power transmitted thereto； and a cutting part brought in close contact with the inner circumferential surface of the acetabular cup and rotating together with the body part to cut the surface of the acetabular cup. According to the present invention, an operation can be easily performed by rotating a blade, together with a rotary shaft part, along the outer circumferential surface of the acetabular cup in the radial direction of the acetabular cup through electric control, which makes it possible to rapidly and accurately detach the acetabular cup from an acetabular bone irrespective of an operator's skill. In addition, it is possible to prevent damage to the blade in advance, minimize damage to an acetabular bone, and accurately detach only the acetabular cup from the acetabular bone by forming a supporting cup and the blade in sizes corresponding to the outer circumferential surface and inner circumferential surface of the acetabular cup and gradually cutting the acetabular bone part, to which the acetabular cup is attached, by rotating the blade at a predetermined angle according to predetermined steps.
