Abstract: For the convenience of repairing the compression band of SQ3X tobacco cutter, an automatic disassembling and assembling device was designed, which was composed of a compression band conveying mechanism, a band link centering mechanism, a pin shaft disassembling and assembling mechanism, a pin shaft clamping and drawing mechanism and an electrical control system. The compression band conveying and band link centering mechanisms cooperate to precisely position the band links; the disassembling and assembling mechanism and the clamping and drawing mechanism cooperate to complete the pin shaft disassembling and assembling; and the electrical control system controls the device and monitors operation data in real time. The device was tested on 40 sets of compression bands in SQ3X tobacco cutter. The results showed that comparing with manual disassembling, the automatic device saved time by 2.155 min/set, and avoided the damages to the band links and pin shafts. This technology promotes the efficiency of compression band repairs and reduces the maintenance cost of tobacco cutter.