The invention discloses a separation sheet rapid mounting mechanism comprising a core shaft. A separation sheet mounting jacket is sleeved on an outer circumferential side of the core shaft. Two notch grooves are arranged with a space of 180 DEG on the outer circumference of the separation sheet mounting jacket. Eccentric tensioning shafts are arranged in the notch grooves. When the separation sheet reel is mounted, at the time when the separation sheet is inserted into the separation sheet mounting jacket, the two eccentric tensioning shafts are rotated in opposite directions, such that outer diameter size of the separation sheet mounting jacket is enlarged, and the separation sheet reel is fixed. Therefore, the mounting of the separation sheet reel is facilitated.