The utility model discloses a false tooth crack detection device, which particularly relates to the technical field of false tooth production and comprises a base, a support frame fixedly connected to the top end of the base, an ultrasonic flaw
detector mounted at the top end of the base, a detection head mounted at one end of the ultrasonic flaw
detector, an adjusting mechanism mounted on the inner side of the support frame, and a limiting component mounted at the top end of the base. The limiting
assembly comprises a first variable frequency motor, the first variable frequency motor is installed in the base, the output end of the first variable frequency motor is fixedly connected with a fixing frame, and a second variable frequency motor is installed in the fixing frame. Therefore, the detection head can conveniently detect the false teeth from multiple angles, the influence of human factors on the detection result is reduced, meanwhile, the detection requirements of the false teeth of different shapes and sizes can be met, and the detection efficiency and flexibility can be improved.