The invention provides a novel supporting wheel device of a box opening shakeout roller. The box opening shakeout roller comprises a shakeout roller body, a circular roller guide rail and four supporting wheel device bodies. An axle of each supporting wheel device body is installed in the middle of a wheel and the two ends of each axle extend out of the two sides of the wheel and then are installed on a bracket of the corresponding supporting wheel device body. The two sides of a cavity in the middle of each wheel are provided with bearings respectively and each axle penetrates through the corresponding two bearings. The portions, outside the two bearings, of each axle are provided with jacking sleeves and nuts. Sealing covers on the outer rings of every two jacking sleeves are provided with elastic sealing rings respectively. A bracket base of each bracket is sequentially provided with a middle bracket seat and a bracket gland. Two semicircular holes between each middle bracket seat and the bracket gland form a circular hole. The two ends of each axle can be installed in the corresponding two circular holes in a matched mode. Each middle bracket seat is arranged on the corresponding bracket base. Each bracket base is installed a bracket pedestal. A sealing structure of the novel supporting wheel device is not prone to being abraded and losing the effect, repair time can be shortened, the brackets are repaired conveniently in a labor-saving mode, and the service life of the shakeout roller can be prolonged.