Test analog device for studying gas migration in mined-out area under different ventilation conditions

The invention discloses a test analog device for studying gas migration in a mined-out area under different ventilation conditions. The device comprises a pipeline system, an analog mined-out area (A), a gas input device (D) and a ventilation device (E), wherein the pipeline system comprises an air inlet pipeline (B) and an air return pipeline (C) which are communicated with outside air; the analog mined-out area (A) has a sealed frame structure; broken waste gangue (A2) is filled in the analog mined-out area (A); the air inlet end of the analog mined-out area (A) is communicated with the air inlet pipeline (B); the air return end of the analog mined-out area (A) is communicated with the air return pipeline (C); the gas input device (D) is communicated with the analog mined-out area (A) through a gas transportation pipeline (A3); and the ventilation device (E) is connected to the tail end of the air return pipeline (C) and provided with an exhaust port (E11) for exhausting gas. By the test analog device, rela