Method and device for measuring thickness of sheet membrane material by using pressure difference change

The invention relates to the technical field of thickness detection, and discloses a method and device for measuring the thickness of a sheet film material by using pressure difference change, and the method comprises the steps: arranging a detection device above a reference roller, enabling the detection device to detect the air inlet pressure and the air return pressure when a to-be-detected object passes through in real time, enabling the to-be-detected object to be attached to the reference roller, and enabling the to-be-detected object to pass through the reference roller; the object to be measured moves along with the rotation of the reference roller; calculating a pressure difference based on the air inlet pressure and the air return pressure; and inputting the pressure difference into a thickness calculation model to calculate and output a thickness value. The thickness value is calculated by detecting the pressure difference, and the problem that thickness detection is greatly limited by the environm