Jacking with adjustable internal spacing and use method thereof

The invention relates to a jacking with an adjustable internal spacing and a use method thereof. The jacking with the adjustable internal spacing comprises a support seat, two baffles, two winding devices and a pull rope, wherein the support seat comprises two side plates and a bottom plate which is connected between the two side plates; the two baffles are clamped on the bottom plate in a sliding mode, first springs are respectively connected between the two baffles and the two side plates on the opposite outer sides, and when the first springs are relaxed, the distance between the two baffles is smaller than the clamped width of a to-be-jacked part; the two winding devices are respectively arranged on the opposite outer sides of the two side plates; and the first end of the pull rope is wound on the winding devices, and the second end of the pull rope penetrates through the corresponding side plates and is tied to the corresponding baffles. According to the jacking, the baffles which can slide and a rotatin