Relating to the technical field of non-destructive testing, the invention in particular discloses a scanner for internal surface nondestructive testing of a rotary part. In the scanner, a circumferential drive motor is installed on a base upper cover, and can drive a hollow rotating shaft mounted in the central axis direction of the base upper cover to rotate; an upper positioning ring is distributed and installed in a base shell, a pedestal is disposed under the base shell, and is equipped with a lower positioning ring, the pedestal and the base shell move up and down to drive the upper positioning ring and the lower positioning ring to rise or fall relative to the upper positioning ring, thus realizing positioning and installation of the mounting base and to-be-tested rotary part; eddy current inspection and video inspection equipment are located in the inner wall of the rotary part, and utilize the circumferential drive motor to drive an eddy current inspection module or video inspection module to inspect. The device provided by the invention is convenient to operate, can efficiently complete automatic non-destructive testing of parts, and is suitable for batch testing of parts.The scanner not only can achieve the inner wall eddy current testing of parts, but also can implement high-definition video detection of inner walls.