The invention relates to a retracting device, an unreeling machine and a reeling and unreeling machine. The invention discloses the unreeling machine comprising a sleeve bearing cavity, wherein the sleeve bearing cavity is internally and sequentially provided with a double-direction thrust bearing arranged on a pull rod, a first compression spring and a limiting component from outer end to inner end; the pull rod is provided with a first shaft shoulder; the first compression spring is clamped between the limiting component and the first shaft shoulder of the pull rod; the pull rod is provided with a force application structure which is used for inwards pushing the double-direction thrust bearing; an inner ring of the double-direction thrust bearing is mounted on a first inner ring sleeve; the first inner ring sleeve is sleeved on the pull rod in a manner that the first inner ring sleeve can inwards slide relatively to the pull rod; the first inner ring sleeve is arranged inside an outer ring which is out of the double-direction thrust bearing, and is provided with a second shaft shoulder which is used for inwards ejecting the inner ring of the double-direction thrust bearing; and the first compression spring directly or indirectly applies the elastic force on the inner end face of the first inner ring sleeve. The invention has the advantages that: in a retracting mechanism, the compression spring is used for transmitting the force so as to improve the tensioning force of the inner side of a steel belt coil, so that the operation of the machine is more stable and reliable, and the manipulation is more convenient.