Exchanging workbench overturn preventing mechanism and numerically-controlled machine tool with same

The utility model provides an exchanging workbench overturn preventing mechanism. The exchanging workbench is capable of sliding on a guide rail of a numerically-controlled machine tool tray station; the mechanism comprises a rolling/supporting device arranged between the tray station guide rail and the exchanging workbench; the exchanging workbench slides along the guide rail without being affected by the rolling/supporting device, and the rolling/supporting device supports the exchanging workbench to limit the inclination angle corresponding to the guide rail. Furthermore, the utility model provides a numerically-controlled machine tool with the mechanism. The rolling/supporting device is arranged for preventing the exchanging workbench from overturning when the exchanging workbench is transferred to a main machine from the tray station; the mechanism is simple in structure, the purpose of preventing overturning can be achieved by optimizing the existing workbench and guide rail only, and the cost is low.