Optimal coal mine gas extraction negative pressure determination method and coal mine gas extraction negative pressure determination system

The embodiment of the invention discloses an optimal coal mine gas extraction negative pressure determination method and a coal mine gas extraction negative pressure determination system, relates to the technical field of coal mine gas extraction, and aims to determine reasonable extraction negative pressure so as to improve the coal seam gas extraction efficiency of a mine. The method comprises the following steps: establishing a gas extraction system; comprising the steps of arranging a plurality of gas extraction units and extraction pipelines; different extraction negative pressure is set for each gas extraction unit, and gas extraction is conducted on the extraction drill hole of each gas extraction unit through the extraction pipeline; monitoring gas extraction parameters of part of extraction drill holes in each gas extraction unit in a preset measurement period by using the monitoring unit, wherein the gas extraction parameters comprise gas extraction flow and gas concentration; and comparing and anal