Long-drill-hole multi-cycle positioning gas pressure measuring device and method

The invention discloses a long-drill-hole multi-cycle positioning gas pressure measuring device and method, the long-drill-hole multi-cycle positioning gas pressure measuring device is used, the steps of device installation, grouting, pressure measurement, slurry discharge and pressure relief, cyclic pressure measurement and gas pressure analysis chart drawing are sequentially carried out, and the gas pressure analysis chart is obtained through the methods of multi-section sealing, accurate positioning, continuous reading and automatic storage. The method comprises the following steps of: accurately measuring the gas pressure of the long drill hole in sections to obtain multi-section local gas pressure and integral gas pressure values of a regional coal seam through which the long drill hole passes, automatically drawing a sectional gas pressure change curve graph, forming a gas pressure analysis graph, and determining the gas pressure of the long drill hole by combining a coal seam burial depth contour line