Online wheel bolt hold-down device

The invention discloses an online wheel bolt hold-down device. The online wheel bolt hold-down device comprises a rack 1, a base plate 2, a pedestal 3, a rotating shaft 4, a floating bar 5, a linear bearing 6 and a spring 7, wherein a servo motor 33, a reducer 32, a controller 31 and the pedestal 3 are fixed on the rack 1 through the base plate 2; the rotating shaft 4 is mounted on the servo motor 33, the reducer 32 and the controller 31; the servo motor 33 can drive a bracket 23 to rotate at any angle through the reducer 32, the controller 31, a thrust bearing 25, a transverse bearing 21 and the rotating shaft 4; a limiting cylinder 30 and a linear bearing A 28 are fixed on a pin pulling bracket 29; a cylinder 16 is mounted on the cylinder bracket 15 through a cylinder flange 17; the output end of the cylinder 16 is connected with a balancing stand 12. The online wheel bolt hold-down device disclosed by the invention can meet the online bolt hold-down requirement for the wheel during the using process, and is safe and reliable in working, high in degree of automation, and suitable for batch production on the production line.