The invention belongs to the technical field of automatic ultrasonic non-destructive inspection for a thread hole belt of nuclear reactor pressure vessels, and particularly discloses a non-destructive inspection circumferential position correction method for the thread hole belt of a nuclear reactor pressure vessel. The non-destructive inspection circumferential position correction method comprises the following steps: step 1. setting a plurality of key slots supporting steps on the nuclear reactor pressure vessel to position references; step 2. installing induction components in the key slots set to the position references; step 3. when a non-destructive inspection trolley for the thread hole belt of the nuclear reactor pressure vessel passes through the induction components, providing the real circumferential position of a scanning trolley by the induction components; and step 4. comparing the real circumferential position of the trolley, which is provided by the induction components with a measured circumferential position which is measured during the own movement process of the trolley by the scanning trolley to carry out circumferential position correction. According to the non-destructive inspection circumferential position correction method disclosed by the invention, the errors of inspection for the circumferential movement position of the trolley can be timely eliminated, the scanning inspection accuracy can be improved, potential safety hazards can be timely found, accurate location can be realized, and a support is provided for the subsequent working.