A novel roller blind shaft is provided, comprising a roller blind having a reel, a lower curtain rod, a curtain fabric arranged between the reel and the lower curtain rod, and a driving device for driving the reel to rotate. A bearing seat is correspondingly provided at both ends of the reel. The novel roller blind shaft comprises: moving devices, which are respectively a first moving device and a second moving device arranged parallel to each other, arranged on the bearing seats at both ends of the reel and perpendicular to the reel and configured to drive the reel to move back and forth to adjust a gap between the curtain fabric and the wall, and a control device electrically connected to the first and second moving devices and configured to synchronously control the first and second moving devices to synchronously drive the reel to move back and forth.