Supporting tool for improving flatness of passenger car arc-shaped roof covering

The invention discloses a supporting tool for improving the flatness of a passenger car arc-shaped roof covering. The supporting tool comprises a supporting mechanism fixed to a covering supporting skeleton and a buffering mechanism located on the inner side of the covering; the supporting mechanism comprises a connecting body and a first supporting beam and a second supporting beam which are connected to the two ends of the connecting body, one end of the first supporting beam is rotatably connected with one end of the connecting body, the other end of the first supporting beam is detachablyconnected with a first fixing head, one end of the second supporting beam is rotatably connected with the other end of the connecting body, and the other end of the second supporting beam is detachably connected with a second fixing head; and the buffering mechanism comprises a rotating rod, a telescopic rod and a pushing rod, one end of the rotating rod is fixedly connected with the pushing rod,the other end of the rotat