Crake depth testing instrument

The utility model relates to a crack depth tester, which comprises a main control system, wherein, the main control system is connected with a transmitting energy transducer through a high-pressure transmitting module, and the high-pressure transmitting module applies the high-pressure pulse on the transmitting energy transducer, so that the transmitting energy transducer generates a sound-wave signal; the received sound wave signal is amplified and filtered by a receiving energy transducer through a signal receiving regulating module, and then is converted into a digital signal by an analog-to-digital conversion module and is conveyed to the main control system; the main control system processes the received digital signal, and directly calculates the depth of the crack; the main control system interacts with the user through a human-computer interface module. The tester has simpler structure and more convenient operation, and can be rapidly mastered and used by the user without the training, and has high precision and low cost.