Self-adaptive downhole dynamic liquid level real-time monitoring device

The invention belongs to the technical field of depth monitoring for dynamic surface of oil well, and discloses a self-adaptive downhole dynamic liquid level real-time monitoring device. The self-adaptive downhole dynamic liquid level real-time monitoring device comprises a wellhead connection device of which the inner portion is provided with a first chamber with one end unsealed, a monitoring device which comprises a microphone and a controller, and an air compressing device which is connected with the controller. The microphone is connected with the controller, and is fixed on the wellhead connection device and is in the first chamber, the first chamber can be communicated with the inner portion of the wellhead sleeve, the wellhead connection device is provided with an air inlet interface and an air outlet interface which are all communicated with the first chamber, and are connected with the output end and input end of the air compressing device respectively. When the wellhead connection device is connect