The utility model relates to an ultrasonic underground water level monitoring device. Water resources are insufficient in the northeast region of China, some problems which cannot be ignored occur in development and utilization of water resources in recent years, and consequentially situations of water resources become serious gradually. The ultrasonic underground water level monitoring device comprises a digital signal processor (4), the DSP (4) is connected with an ultrasonic wave exciting device (7) and a time gain amplifier (3), the time gain amplifier (3) is connected with an active filter (2), the active filter (2) is connected with a receiving device (1), the DSP (4) is connected with a display and communication module (5), and the DSP (4) is connected with a temperature medium compensation device (6). The ultrasonic underground water level monitoring device is used for monitoring underground water levels.