Unlocking method and conveying system

The invention discloses an unlocking method which is used for a conveying system to unlock a ring shrinkage device, the ring shrinkage device comprises an anchor body (110) and a limiting part (132) arranged at the near end of the anchor body, and a limiting ring (121) is arranged at the near end of the anchor body; the unlocking method comprises the steps that the push rod is pushed in the far-end direction, the limiting part is contained in a cavity (310) of the push rod, and a limiting ring (121) is made to be tightly attached to the side wall of the push rod; the limiting ring (121) is separated from the limiting part (132) by pulling the limiting ring (121) or pushing the limiting part (132); therefore, unlocking is completed at the near end of the ring contraction device. By the adoption of the unlocking method, the ring shrinkage device can be unlocked at the near end of the ring shrinkage device, so that the ring shrinkage device is in the shrinkage state, and repositioning and recycling of the ring s