The degassing filter is an auxiliary equipment of a liquid flow meter. When measuring the flow rate of a liquid using a volumetric flow meter, if there is gas mixed in the liquid, both the liquid and the gas mixed in it will be measured simultaneously. Although the flow meter itself has high accuracy, it is meaningless. Therefore, it is necessary to try to remove the gas mixed with the measured liquid before the measured liquid enters the flowmeter. The degassing filter can play a role in separating the gas contained in the liquid from the well, and can filter out impurities and particles contained in the liquid being filtered, thereby ensuring the normal operation of the flow meter and the accuracy of flow measurement.