The invention discloses a method and a device for measuring the pore
volume change of a
porous medium. The method comprises the following steps of: A, putting a workpiece to be tested into a holder; B, closing an upstream control valve and a vent valve, and opening a communication valve, a downstream control valve and a pressure regulating control valve; C, after the device is positioned in the
vacuum state and stable, closing the downstream control valve; D, performing confining pressure stepwise loading / unloading experiments; and E, opening the vent valve, setting a pressure regulating controller to be zero, and finishing the measurement of the pore
volume change. The pressure regulating controller mainly comprises a front fixing sleeve, a rear fixing sleeve, a movable sleeve, a sliding head, a sliding block, a screw rod, a rotary head and a rotary rod, wherein the rear fixing sleeve is provided with a main scale; the movable sleeve is provided with a
branch scale; and the main scale and the
branch scale are used for reading the volume difference. The device is easy to operate, is convenient to read, is stable in performance and reliable in measurement, and is suitable for quick, continuous, accurate and intuitive measurement of wide-range pore
volume change of porous media under the condition of complicated
stress variation.