Testing device and method for researching mesoscale oil-water-gas multiphase flow characteristics of rock

The invention provides a test device and a test method for researching mesoscale oil-water-gas multiphase flow characteristics of rocks. The device comprises a flow control system, a visual monitoring system, a micro model and a data acquisition system, the flow control system comprises a gas flow control system and at least one group of liquid flow control system, and the gas flow control system and the liquid flow control system are connected in parallel and then connected with the micro model through a pipeline; accurate flow input of gas and liquid is provided; the visual monitoring system comprises an observation pipeline, a stereoscopic microscope, a CCD (Charge Coupled Device) camera, an observation table, a supporting device and a CMOS (Complementary Metal-Oxide-Semiconductor Transistor) camera, and provides image observation of different scales; the gas flow control system, the liquid flow control system, the stereoscopic microscope, the CCD camera and the CMOS camera are all connected with the data