Hull flaw detection system and method

The invention relates to a hull flaw detection system and method. The system comprises a radiation module, a development module, a first image collector, a second image collector and a processing module, and the processing module controls the radiation module and the imaging module to move according to the space coordinates of the target point to be measured and the acquired image of the part to be measured, so that the geometric center of the radiation surface of the radiation source on the surface of the ship body is overlapped with the target point to be measured, and the geometric center of the imaging plate is aligned with the target point to be measured. The method is applied to the system. According to the invention, the radiation module and the imaging module can be automatically adjusted, so that the radiation source, the imaging plate and the to-be-detected target point are automatically aligned, manual adjustment is not needed, the labor intensity of workers can be reduced, the alignment accuracy i