Nondestructive testing device and method for defects of inner layer of mobile phone middle frame composite material

The invention relates to the field of mobile phone middle frame detection, and provides a device which comprises a gantry moving module, an ultrasonic probe, an ultrasonic detection pool, a jig and a visual guidance unit in order to solve the problem that a nondestructive detection device and a nondestructive detection method for inner layer defects of a mobile phone middle frame composite material are lacked in the market, the gantry moving module comprises at least two X shafts which synchronously operate, the ultrasonic probe is mounted on the R shaft and extends into the ultrasonic detection pool below, a jig is arranged in the ultrasonic detection pool, and the Z shaft is perpendicular to a product and drives the ultrasonic probe to move along the outer contour of the product; in the moving process, the distance between the ultrasonic probe and the outer contour of the product is fixed, and the ultrasonic probe is perpendicular to the product; the visual guiding unit comprises at least one camera, the ca