Train model propelling device for testing aerodynamic effect of tunnel ancillary facilities

The invention discloses a train model propelling device for testing the aerodynamic effect of tunnel ancillary facilities, which is characterized in that a track is arranged on a bottom plate, and a train model is arranged on the track; a limiting blind hole is formed in the inner ring body; the flexible outer ring body is provided with a sliding groove, and the rolling balls are installed in the limiting blind holes and the sliding groove at the same time. A plurality of circles of pull ropes are wound on the flexible outer ring body and the winding drum, and the winding drum is arranged on an output rotating shaft of the driver; the connecting piece is respectively connected with the inner ring body and the train model; the tunnel model is fixed on the supporting shell, and the track is located inside the tunnel model. A driving part comprises an inner ring body and a flexible outer ring body, and the flexible outer ring body can move around the inner ring body; the flexible outer ring body is connected wit