Reinforcing device for top cap of automobile

The utility model provides a reinforcing device for a top cap of an automobile. The automobile is provided with the top cap and a canopy, the canopy is in joint with the top cap, a containing space is reserved between the canopy and the top cap, the canopy comprises a reinforcing beam, and the reinforcing beam is positioned in the containing space and comprises a bottom plate, two top plates and two side plates. The bottom plate is positioned on an upper surface of the canopy. The two top plates are fixed on a lower surface of the top cap. The two side plates are respectively connected with the bottom plate and the top plates. By the aid of the reinforcing device for the top cap of the automobile, intensity of the canopy of the automobile can be improved so that torsional rigidity of an automobile body can be enhanced.