The invention provides a stratum mobility simulating device. The stratum mobility simulating device comprises a constant speed and constant pressure pump, an intermediate container, a high temperature and high pressure sample allocation device and a model mechanism, wherein one end of the intermediate container is connected with the constant speed and constant pressure pump, one end of the high temperature and high pressure sample allocation device is provided with an air infusion port, the other end of the high temperature and high pressure sample allocation device is connected with the constant speed and constant pressure pump, the model mechanism comprises a flowing section, a capillary tube section and a phase volume fraction tester, the flowing section is provided with a mold section, the mold section comprises a fixed clamping groove and a movable clamping groove, the movable clamping groove can be movably arranged in a scale sliding groove, flat panel grooves are formed in the scale sliding groove, a convection current channel is formed between the fixed clamping groove and the movable clamping groove, the two ends of the convection current channel are the inlet end and the outlet end, the inlet end is connected with the other end of the intermediate container and the end, where the air infusion port is formed, of the high temperature and high pressure sample allocation device, and the outlet end is sequentially connected with the capillary tube section and the phase volume fraction tester. The stratum mobility simulating device is capable of simulating fissures of different opening degrees and stratums with different roughness and the flowing of single-phase fluid or multi-phase fluid in the stratums at different flowing speed, through the arrangement of a corestone, the conditions of the stratums can be simulated in a more realistic mode, the data are accurate, and the application range is wide.