Method for precisely adjusting negative pressure and testing gas desorption amount in negative pressure coring environment

A method for testing the gas desorption amount in the negative pressure coring environment through negative pressure precise adjustment specifically comprises the following steps that firstly, a device for testing the gas desorption amount in the different negative pressure coring environments in an inflation linkage mode is assembled on an underground coal mining site, and the device comprises a movable frame, a coal sample filtering system, a coal sample tank, a negative pressure adjusting system and an inflation system; (2) emptying the negative pressure generating chamber of the negative pressure adjusting system; (3) pumping the coal sample into a coal sample tank; (4) forming negative pressure which is the same as that in the coal sample tank in the negative pressure generation chamber; (5) calculating the accumulated gas desorption amount at different moments under the negative pressure condition; (6) ending the test; (7) drawing a scatter curve of the accumulated gas desorption amount with respect to