Sleeving device

The invention provides a sleeving device. The sleeving device comprises a rack, at least one pair of driving devices mounted on the rack, downward pulling devices connected with the driving devices respectively, and pulling and releasing devices mounted on the downward pulling devices respectively. Each downward pulling device comprises a connecting part connected with the corresponding driving device, a movable air cylinder directly or indirectly fixed to the connecting part, a fixing plate pushed through the movable air cylinder, and a plurality of guide parts mounted on the fixing plate. Each pulling and releasing device comprises a fixed frame fixed to the corresponding guide part, a pulling and releasing air cylinder mounted on the fixed frame, and a pulling and releasing part driven through the pulling and releasing air cylinder. According to the sleeving device, through setting of the positions and structures of the sleeving device and the pulling and releasing devices, a packaging box can enter a predetermined position, and accurate mounting and packaging work is achieved.