Coal seam microscopic physical model displacement law analysis system

The invention discloses a coal seam microscopic physical model displacement law analysis system. A gas source is connected to an injection port of a microscopic model through a gas pressure regulating system; the liquid displacement pump drives the piston container to work, fluid is arranged in the piston container, and the piston container is connected to an injection port of the micro model; the vacuumizing system is connected to an injection port of the micro model; the microscope observation system is arranged at a visual window at the upper end of the microscopic model, the back pressure system and the metering system are connected to an acquisition port of the microscopic model, the software automatic acquisition and image analysis processing software is connected with the microscope observation system, and the annular pressure tracking system is connected into the microscopic model. The device has the advantages that real geological environment simulation conditions of coal bed gas are met, and the gas