The invention discloses an eastward extension type slip shaft. The eastward extension type slip shaft comprises mandrels, a shaft sleeve, an air bag and multiple slip rings. The mandrels are connected with an external high-pressure air source. The shaft sleeve is arranged in the air bag. The shaft sleeve is sleeved with the slip rings. The eastward extension type slip shaft further comprises clamping cylinders, sleeves, positioning keys, slip keys and a supporting mandrel. The two ends of the eastward extension type slip shaft are both provided with the mandrels. The two ends of the supporting mandrel are correspondingly fixed to the mandrels. The supporting mandrel is provided with a gas injection hole communicating with the air bag. Each mandrel is sleeved with one clamping cylinder. The clamping cylinders are sleeved with the shaft sleeve in a connected manner. The eastward extension type slip shaft is simple in structure, low in cost and convenient to use; shaft hub connection and bidirectional fixing are achieved through key grooves, and the problems that the mandrels and the slip rings are not completely concentric and the slip rings and material pipes are not completely concentric are solved; and certain gaps are reserved between the end of the supporting mandrel and the mandrels and should be greater than the thermal elongation of the shaft, and the eastward extension type slip shaft can adapt to bad working environments such as the high-speed rotation, the large material thickness error and the large number of coils without being affected by the high temperature.