During the development of high-pressure shale wells, the formation of bottom hole liquid will seriously affect the normal production. Therefore, it is necessary to keep abreast of the bottom hole liquid at any time, so as to formulate effective drainage measures in time to avoid flooding of gas wells. Traditional monitoring methods such as electronic pressure instrument hung on steel wire have many disadvantages such as complex construction technology and poor timeliness, which are often unable to meet the demands of liquid level data for gas field development. In order to solve this problem, logging unit for liquid level of shale gas wells with high pressure is introduced to monitor the liquid level, by which the liquid level height can be quickly understood. Through the liquid level testing of gas wells in the work area, the problems in the testing process are analyzed and studied. For the uncertain liquid level and other problems, the parameters such as the gain of the liquid level and coupling and so on are adjusted and the construction technology is optimized to make the instrument suitable for the well condition of the block. So that the testing technology for liquid level of South block in Pingqiao is formed. According to the well condition, the interference factors can be eliminated and the real position of liquid level can be accurately identified, and the analysis method for liquid level testing of South Block in Pingqiao is summarized. As a result, the dynamic liquid level data of single well can be obtained quickly and effectively. This method has great reference value for the formulation of single well production system and regional development scheme.