This application design is a water-bearing coal seam downward drilling gas pressure observation system. The invention belongs to the technical field of mine gas pressure determination. It specifically solves the problem that the gas pressure cannot be measured due to accumulated water in the downward borehole. The whole application design includes permeable device, plugging device and measuring device. The permeable device is installed in the borehole and is used to discharge water in the borehole; the blocking device is used to close the borehole; and the pressure measuring device is used to measure the gas pressure of the downward borehole. The application design can better overcome the influence of water in the downward borehole on the determination of gas pressure, especially suitable for the determination of gas pressure in the downward borehole of water-bearing coal and rock. This application design uses electronic devices, which can automatically record, store and transmit gas pressure data periodically, so it can reduce the number of manual records.

The system is a water-bearing coal seam downward borehole gas pressure observation system, belonging to the mine gas pressure measurement technology field.