Upper supporting wheel device of laser welding machine and laser welding machine

The upper supporting wheel device of the laser welding machine comprises a welding trolley and an upper supporting wheel assembly, the welding trolley is provided with a welding head mounting position, and the upper supporting wheel assembly comprises a first mounting base, a driving mechanism, a second mounting base, two first elastic pieces and a rim. The first mounting base is movably mounted beside a welding head mounting position in the vertical direction, the driving mechanism is connected with the first mounting base, the second mounting base is located below the first mounting base and rotatably mounted on the first mounting base along the axis of the moving direction of the welding trolley, and the two first elastic pieces are located between the first mounting base and the second mounting base. The rim is rotationally installed on the second installation base along the axis of the rim. Through rotary arrangement of the second mounting base and elastic cooperation of the two first elastic pieces, the