Defect nondestructive testing method

The invention provides a nondestructive defect detection method. The nondestructive defect detection method comprises the following steps: S1, hoisting a workpiece to a detection device; the detection device comprises a deformable frame capable of lifting and transversely moving, the diameter of the deformable frame is telescopic, and a plurality of detection components are arranged on the deformable frame; s2, scanning the surface shape of the workpiece to obtain the structure of the workpiece; s3, a structural model of the workpiece is constructed, the shape of the deformable frame is adjusted through the structural model, the deformable frame moves in the length direction of the workpiece, and nondestructive testing is conducted on the workpiece through the detection component; and S4, inputting a detection result into the neural network model, and outputting the detection result. The detection component is installed on the deformable frame and can adapt to workpieces of different shapes and sizes through