The invention provides a micron capillary gas-liquid dynamic phase interface testing system. Movement speed of a phase interface is determined through an image processing algorithm by utilizing a dynamic testing device, and then the speed of a movable base is adjusted through a motor by utilizing the speed, thereby enabling a micro-fluid chip to making corresponding movement along a phase interface movement direction, and enabling the phase interface to be correspondingly maintained in a field of view of a camera unit; the measurement basis is provided for dynamic contact angle measurement under a low capillary number and low bond number state, and the data processing efficiency and the measurement precision are greatly improved.