The invention relates to a cross winding device used in an automatic silk reeling machine, in particular to a device capable of reducing silk reeling tension of the automatic silk reeling machine in a cross winding procedure, and belongs to the technical field of the textile machinery. The cross winding device consists of a silk guide drum (2), a silk guide frame (4), a pivot (1) and a pivot screw (1), and is arranged on a cross winding rod (7) of the automatic silk reeling machine by a locating frame (5); the silk guide drum is fixed on the pivot, the pivot is arranged at the center of the pivot screw, and the pivot screw is fixed on the locating frame; and the silk guide frame is fixed on the locating frame, and a silk guide port on the silk guide frame is positioned above the silk guide drum. In the cross winding device, the silk guide drum is arranged on the cross winding rod, and the rolling friction of the drum replaces sliding friction of a cross winding ceramic base, which can help obviously reduce the silk reeling tension, that is, good raw silk only obtained at a low speed can be manufactured at a higher silk reeling speed.