The utility model discloses a regulating device, including bearing frame, main shaft and stopper, the bearing frame is equipped with first movable chamber, the main shaft pin joint is in first movableintracavity, the stopper is installed in first movable intracavity with mobilizable mode, the main shaft is equipped with spacing portion, the one end that the stopper is close to spacing portion isequipped with butt portion, the butt position is in spacing troops under one's command side to can be towards being close to or keeping away from spacing portion and move, the interval forms the freegap between spacing portion and the butt portion, the free gap is used for restricting the main shaft in the flexible volume of the displacement of first movable intracavity. The utility model discloses a regulating device, flexible the measuring of displacement that can realize the quick adjustment main shaft. Simultaneously, this regulating device not only need not to dismantle, moreover easy operation at the in -process of adjusting the flexible volume of main shaft displacement. Like this, be favorable to improving the efficiency of adjusting the flexible volume of main shaft displacement.