The invention discloses a turning roll device of a reversible cold rolling mill unit. The turning roll device comprises two fixing bearing bases, the front edge of the lower end of each fixing bearing base is provided with a groove which is meshed and clamped with a step on a bottom plate, and the rear edge of the lower end of each fixing bearing base is provided with a positioning stopping block used for limiting. A combined piece of a turning roll and bearings at the two ends of the turning roll is mounted in an open groove in the upper portion of each fixing bearing base, and a gland bearing pedestal is buckled to the opening edge of the open groove in the upper portion of each fixing bearing pedestal. According to the turning roll device of the reversible cold rolling mill unit, the overall form of each bearing pedestal of the turning roll is changed to be of a split structure, the phenomenon that a large amount of time is consumed for dismounting, mounting and maintaining due to the fact that the device breaks down in the using process is avoided, the phenomenon that due to the difference of the technological levels of maintaining and mounting personnel, the mounting precision of equipment cannot meet the design requirement, so that the normal production of the unit is affected is also avoided, and maintaining and replacing can be achieved conveniently and quickly.